HOME   Cart(0)   Quotation   About-Us Policy PDFs Standard-List
www.ChineseStandard.net Database: 189759 (19 Oct 2025)

GB/T 8363-2018 English PDF

US$519.00 · In stock
Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 8363-2018: Steel -- Drop-weight tear tests method
Status: Valid

GB/T 8363: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 8363-2018English519 Add to Cart 5 days [Need to translate] Steel -- Drop-weight tear tests method Valid GB/T 8363-2018
GB/T 8363-2007English519 Add to Cart 3 days [Need to translate] Test method for drop -- Weight tear tests of steel products Obsolete GB/T 8363-2007
GB/T 8363-1987English439 Add to Cart 4 days [Need to translate] Metallic materials--Drop-weight tear tests of ferritic steels Obsolete GB/T 8363-1987

PDF similar to GB/T 8363-2018


Standard similar to GB/T 8363-2018

GB/T 8358   GB/T 9790   GB/T 10573   GB/T 2039   

Basic data

Standard ID GB/T 8363-2018 (GB/T8363-2018)
Description (Translated English) Steel -- Drop-weight tear tests method
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard H22
Classification of International Standard 77.040.10
Word Count Estimation 26,276
Date of Issue 2018-02-06
Date of Implementation 2018-11-01
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

GB/T 8363-2018: Steel -- Drop-weight tear tests method

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Steel-Drop-weight tear tests method ICS 77.040.10 H22 National Standards of People's Republic of China Replace GB/T 8363-2007 Steel drop hammer tear test method Published on.2018-02-06 2018-11-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Administration issued

Content

Foreword III 1 Scope 1 2 Normative references 1 3 Test principle 1 4 Terms and Definitions 1 5 Symbols and Description 2 6 sample 2 7 Test equipment and instruments 5 8 Test step 7 9 Test results evaluation 8 10 Uncertainty of test results 11 11 Test report 11 Appendix A (Normative Appendix) Treatment of brittle fracture zone on the fracture surface of controlled rolling pipeline steel and assessment of abnormal fractures 13 Appendix B (informative) DWTT instrumentation system (oscilloscope system) 16 Reference 20

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 8363-2007 "Test method for falling weight of ferritic steel drop hammer", compared with GB/T 8363-2007, the main technology The content changes are as follows. --- Modified the standard name according to the scope of application of the standard; --- Added a description of the total absorbed energy, crack initiation energy, and crack propagation energy in terms and definitions (see Chapter 4); --- Added symbols and descriptions (see Chapter 5); --- Modified the description of the bottom radius requirement of the chevron notch (see Chapter 6); --- Increased sample support device should have anti-sloshing requirements (see Chapter 7); --- Modify the "net section" in the text to "judgment area"; --- Increased holding time of the sample in a gaseous medium (see Chapter 8); --- Added descriptions about the determination of Et, the determination of Ei and Ep (see Chapter 9); --- Increased the description requirements for thinning methods in the report; --- Added the redemption requirements for Et, Ei, Ep in the report of Chapter 10; --- Revised the normative appendix A method for judging brittle areas on fracture separation surfaces; --- In Appendix A, a schematic diagram of abnormal fractures has been added; --- Added informative Appendix B "DWTT Test Instrumentation System (Oscilloscope System)"; --- Added references. This standard was proposed by the China Iron and Steel Association. This standard is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183). This standard was drafted. Baoshan Iron and Steel Co., Ltd., China National Petroleum Corporation Pipe Research Institute, Shenzhen Wan Test Suite Preparation Co., Ltd., Metallurgical Industry Information Standards Institute, Jiangsu Province Special Equipment Safety Supervision and Inspection Institute Wuxi Branch. The main drafters of this standard. Fang Jian, Chen Hongda, Huang Xing, Dong Li, Zhang Jianwei, Sun Xiaowei. The previous versions of the standards replaced by this standard are. ---GB/T 8363-1987; GB/T 8363-2007. Steel drop hammer tear test method

1 Scope

This standard specifies the test principle, terminology and definitions, symbols and descriptions, samples, test equipment and instruments for the test method of steel drop hammer tear. Apparatus, test procedures, uncertainty of test results and test reports. This standard is applicable to the drop weight tear test and the result evaluation of steel plates and pipes with a thickness of 3mm~40mm.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 2975 steel and steel products mechanical properties test sampling position and sample preparation

3 Test principle

Test the drop weight of the steel, such as the shear plane, by using a drop hammer or pendulum of a certain height to break the specimen in the state of the simply supported beam. Product percentage, total absorbed energy, crack initiation energy, etc.

4 Terms and definitions

The following terms and definitions apply to this document. 4.1 Drop hammer tear test drop-weightteartest; DWTT Test the specimen in the state of simply supported beam with a drop hammer or pendulum of a certain height and evaluate the test of the relevant performance results. 4.2 Tube diameter to wall thickness ratio diameter-to-thicknessratio The ratio of the diameter D of the steel pipe to the wall thickness t, referred to as D/t. 4.3 Ductile fracture zone ductilefracturesurfaces Shear fracture zone shear-fracturesurfaces The fracture surface of the sample which is broken according to the method has a dark gray fiber-like fracture zone. 4.4 Brittle fracture zone Cleavage fracture zone cleavage-fracturesurfaces The fracture surface of the sample which is broken according to the method is a bright and crystalline fracture zone. 4.5 Percentage of sheared area percentshearareaofthefracturesurface The ratio of the area of the ductile fracture zone measured by this method to the area of the assessment area used for evaluation (see 9.2 for the definition of the area of the area) The percentage is expressed as SA%. 4.6 Pressing the gap pressednotch A V-notch pressed on the specimen with a special indenter on one side. 4.7 Herringbone gap chevronnotch A herringbone notch that is machined on one side of the specimen by machining. 4.8 Total absorbed energy totalabsorbedenergy Et The total energy consumed by the DWTT sample was broken. 4.9 Crack initiation energy crackinitiationenergy Ei The energy consumed when the DWTT sample is cracked. Note. The maximum force point on the force-displacement curve is usually used as the nominal initiation point. 4.10 Crack propagation energy crackpropagationenergy Ep The energy consumed by the DWTT sample to break into the fracture process.

5 symbols and instructions

The symbols and descriptions used in this standard are shown in Table 1. Table 1 Symbols and description Symbol description unit t sample thickness or wall thickness mm Et total absorbed energy kJ Ei crack initiation energy kJ Ep crack growth energy kJ

6 sample

6.1 Sample location and direction of the sample 6.1.1 When sampling on steel plates, the sampling location and direction shall be carried out in accordance with the relevant product standards, protocols or with reference to GB/T 2975. kind The blank should be taken from the vicinity of other mechanical properties. When sampling on steel pipes, in accordance with the relevant standards or agreements, if there is no regulation, according to Figure 1 Show sampling. a) straight seam welded steel pipe b) spiral welded steel pipe Description. 1---weld. Figure 1 Schematic diagram of the sampling site on the steel pipe 6.1.2 When sampling on steel pipes, the test specimens may be flattened with full flattening or not. Usually, when D/t ≥ 40, use a fully flattened sample, D/t< 40 When the sample is not fully flattened, the original curvature of the steel tube is retained in the middle portion of the sample from 25 mm to 51 mm long. If the sample is flattened If the product is distorted, the sample should be discarded and resampled. If the test results of the full flattened specimen and the incomplete flattened specimen are significantly different, or the arbitration test For inspection, the specimen shall be flattened incompletely. Note. Full flattening of the specimen will result in a decrease in the percentage of fracture shear area. 6.2 Number of samples The number of samples shall be in accordance with the relevant standards or protocols. If there is no regulation, generally take two samples. 6.3 Sample size and tolerance Regardless of the method used to cut the specimen from the steel or steel pipe, the shear deformation zone or the heat affected zone should be removed by machining. Sample Dimensions and tolerances are shown in Figure 2. The unit is mm Description. A---section line. Figure 2 Pressing the notched specimen 6.4 Notch geometry The notch geometry can be a pressed notch or a herringbone notch. Low-toughness pipeline steel and other steels should use pressing notch, high toughness Pipeline steel is preferred for herringbone gaps. The herringbone gap can reduce the energy absorbed by DWTT and reduce the high toughness pipeline steel to a certain extent. The probability of an abnormal fracture as often defined in Appendix A. The requirements for suppressing gaps and herringbone gaps are as follows. a) Pressing the notch is to press the V-notch shown in Figure 2 on the specimen with a special steel press with a cutting edge angle of 45 ° ± 2 °. Not allowed Other mechanical processing methods are used. Check the blade edge and angle before pressing the notch, the blade should not be defective, press in The depth should conform to the tolerance range shown in Figure 2. Note. If there are more samples to be tested, a device that controls the depth of penetration can be used. b) The chevron notch can be cut by wire or sawed into the shape shown in Figure 3. The bottom radius of the notch is not required (the bottom of the notch can be Round or flat). The unit is mm Description. A---section line. Figure 3 Herringbone notch sample 6.5 sample thickness If the thickness of the steel plate or the wall thickness of the steel pipe is not more than 19.0 mm, the original plate thickness or the original wall thickness sample is applied. If the thickness or wall thickness is greater than 19.0mm, according to the maximum energy of the test machine, use any of the following methods. a) original plate thickness or original wall thickness sample; b) Thinning the specimen, one or both surfaces of the specimen may be machined to reduce the thickness of the specimen to 19.0 mm ± 0.12mm. If a thinned sample is used, the actual test temperature should be lower than the specified test temperature, as shown in Table 2, but The test report is still filled in at the specified test temperature. The report should include a thinning method (single-sided thinning or double-sided thinning) [1]. Note. Different thinning methods may affect the test results. Table 2 Test temperature reduction Steel plate thickness or steel pipe wall thickness Mm Test temperature reduction >19.0~22.2 >22.2~28.6 >28.6~40.0

7 Test equipment and instruments

7.1 The test machine can be a pendulum or a drop hammer. In order to ensure that the sample is torn off at one time, the test machine should have sufficient energy. 7.2 The impact energy of the test machine can be selected by referring to the total absorbed energy and partial pressure of the Charpy V-notch standard impact sample given in Figure 4. The approximate relationship between the gap DWTT and the herringbone gap DWTT absorbs energy. Fig.4 Approximate relationship between the total absorbed energy of the Charpy V-notch standard impact specimen and the total absorbed energy of the pressed gap and the herringbone notch DWTT 7.3 The test machine shall have a solid foundation and a stable main structure, and all the weights and components of the hammer part shall always be in a tight state. 7.4 When determining the total absorbed energy of DWTT, the test machine shall meet the following requirements. a) The relative error between the initial position energy and the nominal value of the test machine is within ±1%; b) The loss of air impact energy should be within 0.5% of the rated range value. 7.5 The impact speed of the test machine should be in the range of 5m/s~9m/s. 7.6 The hammer blade should have sufficient hardness (HRC >56). The radius of curvature of the hammer blade and its tolerance should meet the requirements of Figure 5, when the hammer hits the specimen, The center line of the hammer blade should be consistent with the center of the span of the support, and the deviation is not more than ±1.5mm. The unit is mm Figure 5 DWTT sample support device and hammer edge size 7.7 The sample support device shall meet the following requirements. a) The support of the specimen shall have sufficient hardness (HRC >56), and the dimensions and tolerances shall comply with the requirements of Figure 5; b) The two seats should be parallel and contoured. The span of the support shall comply with the provisions of Figure 5; c) When using the drop hammer tester, the support device shall have an attachment to prevent the sample from shaking or falling. Note. The sample support device should have sufficient space to ensure that the sample is punched off once and unimpeded through the support, which requires a comprehensive consideration of the curvature of the hammer blade. The selection of the actual tolerance of the diameter and the support radius, the adjustment of the span of the support, and the selection of the actual tolerance of the sample width, the distance between the inner sides of the two seats is reduced by the hammer The diameter and the value of the width of the sample of 2 times are not less than 5 mm. 7.8 The indication error of the temperature measuring instrument is not more than ±0.5 °C, the resolution of the digital display should be no more than 0.1 °C, and the minimum graduation of the scale should be small. At 1 ° C.

8 test steps

8.1 There are two ways to heat and cool the sample. a) Liquid medium. in the temperature range of -75 ° C ~ 100 ° C, the sample should be completely immersed in a heat preservation device with a suitable liquid Within, the spacing between the specimens and the distance of the specimen from the edge or bottom of the holding device shall be at least 25 mm or at least equal to the specimen Thickness, whichever is larger. The liquid temperature should be within ±1 °C of the test target temperature. The shortest guarantee of the sample at the test temperature The temperature time is given in Table 3. In order to ensure a uniform temperature, the liquid in the holding device should be kept flowing continuously. Table 3 The shortest holding time of the sample in liquid medium Sample thickness t Mm Minimum holding time Min t< 12.7 15 ≥12.7~< 25.4 25 ≥25.4~< 38.1 45 ≥38.1~≤40 48 b) gaseous medium. place the sample in a closed container with at least between the sample and between the sample and the container wall (bottom and side walls) 50mm or twice the thickness of the sample, the larger. Measures should be taken in the container to circulate the gas medium to ensure The temperature is uniform, and the temperature of all effective spaces in the container is within ±1 °C of the test target temperature. The shortest holding time should be as follows The provisions of Table 4. Table 4 Minimum holding time of sample in gaseous medium Sample thickness t Mm Minimum holding time Min Forced convection natural convection < 12.7 80 140 ≥12.7~25.4 120 230 >25.4~38.1 150 310 8.2 Remove the sample from the holding device and load it into the test machine and interrupt it quickly. The time from the exit of the sample to the interruption of the sample should not exceed 10s, if it has not been impacted for more than 10s, the sample should be returned to the insulation device for at least another 10 minutes. Not allowed to use and test temperature Significantly different instruments touch the center of the sample. 8.3 When installing the sample, appropriate measures shall be taken to make the center line of the sample gap coincide with the center of the span of the support, the allowable deviation is ±1.5mm, and Make the center line of the notch of the sample consistent with the center line of the hammer, and allow the deviation to be ±1.5mm. 8.4 If the test temperature exceeds the range specified in 8.1, the allowable deviation of the medium temperature in the holding device from the required test temperature is ±1 °C, or Agreement provisions.

9 Test results evaluation

9.1 General DWTT test results include assessing the percentage of shear area (SA%) of the fracture or simultaneously measuring the total absorbed energy of the DWTT sample. (Et), crack initiation energy (Ei) and crack growth energy (Ep). 9.2 Rating SA% 9.2.1 Overview There are usually two types of fracture morphology of DWTT specimens. One is that the fracture cross section of the specimen is all ductile fracture zone or brittle fracture zone. One is to present a brittle fracture zone from the root of the notch, from brittle fracture to ductile fracture from the root of the notch to the hammer side. 9.2.2 Determining the assessment area of the fracture The fracture of the specimen is evaluated as the percentage of the shear area on the measurement area. The sample with thickness t≤19.0mm is determined as shown in Figure 6. The evaluation area of the mouth, that is, subtracting a sample thickness from the tip of the pressed notch or the chevron notch on the cross section of the sample and hammering The side is deducted from the section thickness of a sample; the sample having a thickness t >19.0 mm is judged from the cross section of the sample from the root of the pressed notch Or the tip of the chevron notch and the section after deducting 19.0 mm from the hammer side. Description. 1--- suppress gap or herringbone gap; 2---The judgment area of the fracture. Figure 6 Judging area of the fracture 9.2.3 Determination of ductile fracture zone and brittle fracture zone 9.2.3.1 Within the assessment area of the fracture, the ductile fracture zone and the brittle fracture zone are determined according to the definitions of 4.3 and 4.4. 9.2.3.2 If the fracture morphology shown in Figure 7 appears, the toughness in the zone between ductile fracture and brittle fracture shall be evaluated. The severe fracture portion is also treated as a brittle fracture. Description. 1---brittle fracture zone; 2---Assess SA% only includes the ductile fracture zone of the edge portion of the fracture. Fig.7 Fracture morphology between tough and brittle fracture zones 9.2.4 Calculating the percentage of sheared area For the treatment of brittle fracture zone on the fracture surface of controlled rolling pipeline steel and the assessment of abnormal fracture, it shall be carried out in accordance with the provisions of Appendix A. can Calculate the percentage of shear area using the following method. a) Quadrature method. The area of the brittle fracture zone is measured by the accumulator on the fracture photograph or optical projection diagram with the ruler. The area of the evaluation area is subtracted from the area of the brittle fracture area, divided by the area of the assessment area, and expressed as a percentage. This method is generally Used in arbitration or controversial and difficult to determine by other methods. b) Comparison method. the fracture of the broken sample is compared with a set of fractured photos or physical fractures of the same thickness Ratio, the percentage of the cut area is obtained. The photo of the fracture and the calibration of the physical fracture are carried out in accordance with the provisions of the method of accumulation. c) Measurement method. According to the three typical sample fracture profiles given in Figure 8, the percentage of shear area is determined by the following method. --- If the fracture morphology is between Figure 8a) ~ Figure 8b), measure the width A and length B of the brittle fracture zone between the "t" lines, thickness t < 19.0mm sample is calculated according to formula (1). The sample with thickness t≥19.0mm is calculated according to formula (2). Percent area cut. The percentage of the sheared area calculated by the formulas (1) and (2) is usually from 45% to 100%. SA%= (71-2t) t-0.75AB (71-2t)t × 100 (1) SA%= 33t-0.75AB 33t × 100 (2) In the formula. SA%---percentage of sheared area; t --- sample thickness in millimeters (mm); A --- The width of the brittle fracture zone at the "t" line at the root of the notch, in millimeters (mm); B --- The length of the brittle fracture zone between the “t” lines, in millimeters (mm). Note. For samples of different thicknesses, the relationship between SA% and A and B can be pre-made. After measuring the dimensions of A and B, the relationship between SA% and A and B is shown. Determine the percentage of the cut area. Fig. 9 is an example of a relationship between SA% and A, B of a sample having a thickness of 10 mm. a) SA%=100 b) SA%≈45 c) brittle fracture zone runs through the full section Description. 1---t, the thickness of the sample; 2---"t" line; A---section line; 4---A1 width [see equation (3)]; 5---A2 width [see equation (3)]; 6---A3 width [see equation (3)]. Figure 8 Typical DWTT sample fracture morphology --- If the fracture is in the shape of Figure 8c), measure the width of the brittle fracture zone at the midpoint between the two "t" lines and the two "t" lines A1, A2, and A3, the percentage of the sheared area is calculated according to formula (3). SA%= T-(A1 A2 A3)/3 t ×100 (3) In the formula. SA%---percentage of sheared area; t --- sample thickness in millimeters (mm); A1 --- the width of the brittle fracture zone at the "t" line at the root of the notch, in millimeters (mm); A2 --- The width of the brittle fracture zone at the "t" line on the hammer side, in millimeters (mm); A3 --- The width of the brittle fracture zone at the midpoint between the two "t" lines at the midpoint of the "t" line, in millimeters (mm). Fig. 9 Relationship between SA% and A and B of 10 mm thick sample Note. Other methods equivalent to the above three methods (such as optical fracture analyzer, machine vision system, etc.) can also be used to determine the percentage of shear area. 9.3 Determination of Et 9.3.1 According to the principle of conservation of mechanical energy, when using the pendulum tester, the position of the initial release angle and the sway angle of the pendulum is determined by the pointer or digital display. Et is directly shown. When using the drop hammer tester, the amount of kinetic energy and potential energy change before and after the impact fracture of the sample is measured, and Et is calculated. 9.3.2 When using the pendulum tester, check the return to zero or no-load energy consumption of the pendulum before the test. Note. With the pendulum tester, the total absorbed energy Et should be 20%~80% of the actual potential energy of the test machine. 9.4 Determination of Ei and Ep The force-displacement curve of the DWTT specimen during the impact fracture process can be recorded by the instrumentation system (oscilloscope system). Ei and Ep, see Appendix B. 9.5 Test is invalid The test is invalid when the sample is not completely broken by one impact due to insufficient energy of the test machine or warpage of the sample during impact. Note. When the thickness of the sample is less than 5mm, it is easy to warp. 10 Uncertainty of test results 10.1 Factors affecting the uncertainty of test results include sample type, sample size, dimensional measurement uncertainty, sample alignment state, test Temperature, material properties, test machine related parameters and fracture assessment methods. 10.2 For the influence of the above factors on the uncertainty of the test results, there is still insufficient data analysis, so it is not yet possible to assess the test knot. The uncertainty of the fruit. 11 test report 11.1 The test report should include the following. a) the standard number; b) a description of the material; c) sample number; d) the location and orientation of the sample in the product; e) the nominal thickness of the sample (or the actual thickness of the sample); f) sample type; g) the way the sample is thinned; h) test temperature; i) Percent cut area SA% of the fracture, rounded to an integer. 11.2 The test report may also include the following. a) Et, repaired to 0.1kJ; b) Ei, repaired to 0.1kJ; c) Ep, revised to 0.1kJ.

Appendix A

(normative appendix) Treatment of Brittle Fracture Zone on Fracture Separation Surface of Controlled Rolling Pipeline and Evaluation of Abnormal Fracture A.1 Treatment of brittle fracture zone on fracture surface of controlled rolling pipeline steel A fracture surface with brittle fracture characteristics may appear in the fracture of the controlled rolling pipeline steel sample, as shown in Figure A.1. When facing the sample fracture, When the separation surface is parallel to the rolling surface of the sample, the brittle fracture zone on the separation surface is not counted; when the separation surface is at an...

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 8363-2018_English be delivered?

Answer: Upon your order, we will start to translate GB/T 8363-2018_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 8363-2018_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 8363-2018_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to [email protected]. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version GB/T 8363-2018?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 8363-2018 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.