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GB/T 5216-2014 English PDF

GB/T 5216: Historical versions

Standard IDUSDBUY PDFLead-DaysStandard Title (Description)Status
GB/T 5216-2014155 Add to Cart Auto, < 3 mins Structural steels subject to end-quench hardenability requirements Valid
GB/T 5216-2004105 Add to Cart Auto, < 3 mins Structural steels subject to end-quench hardenability requirements Obsolete
GB/T 5216-1985919 Add to Cart 6 days Technical requirements for structural steel with specified hardenability bands Obsolete

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Basic data

Standard ID: GB/T 5216-2014 (GB/T5216-2014)
Description (Translated English): Structural steels subject to end-quench hardenability requirements
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H40
Classification of International Standard: 77.140.10
Word Count Estimation: 50,585
Date of Issue: 12/5/2014
Date of Implementation: 9/1/2015
Older Standard (superseded by this standard): GB/T 5216-2004
Quoted Standard: GB/T 222; GB/T 223.3; GB/T 223.5; GB/T 223.11; GB/T 223.13; GB/T 223.14; GB/T 223.16; GB/T 223.17; GB/T 223.18; GB/T 223.19; GB/T 223.23; GB/T 223.25; GB/T 223.26; GB/T 223.53; GB/T 223.54; GB/T 223.58; GB/T 223.59; GB/T 223.60; GB/T 223.61; GB/T 223.62;
Regulation (derived from): Announcement of Newly Approved National Standards 2014 No. 27
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This Standard specifies the ordering contents guaranteed hardenability structural steel bars, classification and code, size, shape, weight and tolerances, technical requirements, test methods, inspection rules, packaging, marking and quality certificate.

GB/T 5216-2014: Structural steels subject to end-quench hardenability requirements

---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.
Structural steels subject to end-quench hardenability requirements ICS 77.140.10 H40 National Standards of People's Republic of China Replacing GB/T 5216-2004 Guarantee hardenability structural steel 2014-12-05 release 2015-09-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released Directory Preface Ⅰ 1 Scope 1 2 Normative references 1 3 Order contents 2 4 classification and code 3 5 size, shape, weight and tolerance 3 6 Technical Requirements 3 7 Test Methods 9 8 Inspection rules 9 9 packaging, marking and quality certificate 10 Appendix A (Informative) Calculation of Ideal Critical Diameter of Steel DI 43 Appendix B (informative) Table 1 in this standard part of the table with foreign brands comparison table 46

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 5216-2004 "guaranteed hardenability structural steel." This standard compared with GB/T 5216-2004 main changes are as follows. --- The standard scope of application removed the "diameter or thickness of not less than 30mm" limit; --- Classification and code canceled "steel by metallurgical quality is divided into high-quality steel and high-quality steel"; --- Grade from 24 to 32 (excluding sulfur steel), an increase of 25CrH, 28CrH, 35CrMoH, 17Cr2Ni2H, 22CrNiMoH, 27CrNiMoH, 40CrNi2MoH, 18Cr2Ni2MoH 8 grades and related technical requirements; --- Adjust the upper and lower limits of some brands in Table 1. Boron content of boron-containing steel to 0.0008% lower limit, the upper limit of unity 0.0035%. The upper limit of manganese content in 17CrMnBH steel was adjusted from 1.30% to 1.40%. The upper limit of manganese content in 20CrMnTiH steel From 1.15% to 1.20%, the upper limit of chromium content was adjusted from 1.35% to 1.45%; the sulfur content of sulfur-containing steel from 0.020% Adjusted to 0.015%; 15CrMoH steel carbon content range corrected for 0.12% ~ 0.18%; --- Unified sulfur and phosphorus impurity elements and copper, chromium, nickel content requirements of residual elements; --- Increasing the oxygen content of steel is not greater than 0.0020% of the requirements; --- Added 16CrMnH and 20CrMnH steel annealing or high temperature tempering hardness requirements; --- 6.5.1 added the "nominal diameter or thickness of less than 30mm steel allowed sampling in the middle of the blank to be measured" requirement; --- Change the hardenability of the said method; --- Table 3 on the organization requirements for low magnification grouping rules, and increased the continuous casting steel "center segregation" requirements; --- Table 4 requirements for non-metallic inclusions grouping requirements; --- Appendix A "Steel hardenability calculation method" was revised to "the ideal critical diameter of steel DI value calculation method." This standard is proposed by China Iron and Steel Association. This standard by the National Standardization Technical Committee Steel (SAC/TC183) centralized. This standard was drafted. Steel Research Institute, Jiangyin Xingcheng Special Steel Co., Ltd., Daye Special Steel Co., Ltd., Shijiazhuang Steel Iron Co., Ltd., Northeast Special Steel Group Co., Ltd., Metallurgical Industry Information Standards Institute, Baosteel Special Steel Co., Ltd., Panzhihua Iron and Steel Mission River Great Wall Special Steel Co., Ltd., Suzhou Su Xin Special Steel Co., Ltd., Shougang Corporation. The main drafters of this standard. Wang Mao ball, Luan Yan, Cao Hongfu, Li Po-peng, Wang Xinkang, Chen Qingxin, Zhang Shuping, Song Ningqiu, Yu Jie, Shi Li, Zhang Lina, Meng Ruiying, Kim Weisong. The previous version of this standard release situation. --- GB 5216-1985; --- GB/T 5216-2004. Guarantee hardenability structural steel

1 Scope

This standard specifies the hardenability of structural steel bars to ensure the order content, classification and code, size, shape, weight and tolerance, technology Requirements, test methods, inspection rules, packaging, marking and quality certificates. This standard applies to machinery manufacturing to ensure the hardenability of hot-rolled and hot forged steel bar structure (hereinafter referred to as steel). End quenching method Measured or calculated by formula steel hardenability.

2 Normative references

The following documents for the application of this document is essential. For dated references, only dated references apply This document. For undated references, the latest edition (including all amendments) applies to this document. GB/T 222 steel finished chemical composition tolerance GB/T 223.3 Methods for chemical analysis of iron, steel and alloy diamipin methane Molybdophosphoric acid Gravimetric method for the determination of phosphorus content GB/T 223.5 Steel - Determination of acid-soluble silicon and total silicon - Reduced molybdosilicate spectrophotometry GB/T 223.11 steel and alloy chromium content - Visual titration or potentiometric titration GB/T 223.13 Methods for chemical analysis of iron, steel and alloy - The ferrous ammonium sulfate titration method for the determination of vanadium content GB/T 223.14 Methods for chemical analysis of iron, steel and alloy - The tantalum reagent extraction photometric method for the determination of vanadium content Methods for chemical analysis of iron, steel and alloy - The chromochrome acid photometric method for the determination of titanium content GB/T 223.17 Methods for chemical analysis of iron, steel and alloy - The diantipyrylmethane spectrophotometric method for the determination of titanium content GB/T 223.18 Methods for chemical analysis of iron, steel and alloy - Sodium thiosulfate - iodometric method for the determination of copper content GB/T 223.19 Methods for chemical analysis of iron, steel and alloy The neocuproine-chloroform extraction spectrophotometric method for the determination of copper content GB/T 223.23 steel and alloy nickel content - dimethylglyoxime spectrophotometric method Methods for chemical analysis of iron, steel and alloy The dimethylglyoxime gravimetric method for the determination of nickel content Steel and alloy - Determination of molybdenum content - Thiocyanate spectrophotometric method GB/T 223.53 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrophotometric method for the determination of copper content GB/T 223.54 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrophotometric method for the determination of nickel content GB/T 223.58 Methods for chemical analysis of iron, steel and alloy - The sodium arsenite - sodium nitrite titration method for the determination of manganese content GB/T 223.59 steel and alloy - Determination of phosphorus content bismuth phosphomolybdate blue spectrophotometry and antimony phosphomolybdate blue spectrophotometry GB/T 223.60 Methods for chemical analysis of iron, steel and alloy - The perchloric acid dehydration gravimetric method for the determination of silicon content Methods for chemical analysis of iron, steel and alloy - The ammonium phosphomolybdate volumetric method for the determination of phosphorus content GB/T 223.62 Methods for chemical analysis of iron, steel and alloy - The butyl acetate extraction spectrophotometric method for the determination of phosphorus content GB/T 223.63 Methods for chemical analysis of iron, steel and alloy - The sodium periodate (potassium) photometric method for the determination of manganese content Iron and steel - Determination of manganese content - Flame atomic absorption spectrometric method Steel and alloy - Determination of sulfur content - Methylene blue spectrophotometric method GB/T 223.68 Methods for chemical analysis of iron, steel and alloy - The potassium iodate titration method after combustion in tube furnace for the determination of sulfur content Steel and alloy carbon content - Determination of gas volumetric method after combustion in a tube furnace GB/T 223.69 GB/T 223.71 Methods for chemical analysis of iron, steel and alloy The gravimetric method for the determination of carbon content after combustion in the tube furnace Steel and alloy - Determination of sulfur content - Gravimetric method Steel and alloy - Determination of boron content - Methanol distillation - Curcumin photometric method GB/T 223.76 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrometric method for the determination of vanadium content GB/T 223.78 Methods for chemical analysis of iron, steel and alloy - The curcumin direct spectrophotometric method for the determination of boron content GB/T 223.79 steel multi-element content determination by X-ray fluorescence spectrometry (conventional method) GB/T 223.81 steel and alloy total aluminum and total boron content - microwave digestion - inductively coupled plasma mass spectrometry GB/T 223.84 steel and alloy - Determination of titanium content - Diampyridin methane spectrophotometry GB/T 223.85 steel and alloy sulfur content - Induction furnace combustion infrared absorption method GB/T 223.86 steel and alloy carbon content - Determination of induction furnace combustion infrared absorption method GB/T 225 steel quenching end quench test method (Jominy test) GB/T 226 low magnification organizations and defects acid corrosion test GB/T 228.1 Tensile testing of metallic materials - Part 1. Room temperature test method GB/T 229 Charpy pendulum impact test method for metallic materials GB/T 231.1 Brinell hardness test of metallic materials - Part 1. Test methods GB/T 702 hot-rolled steel bar size, shape, weight and tolerances GB/T 908 forged bar size, shape, weight and tolerances GB/T 1979 structural steel microstructure defects rating chart GB/T 2101 steel acceptance, packaging, marking and quality certificate of the general provisions GB/T 2975 steel and steel products mechanical properties test sampling location and sample preparation GB/T 4336 carbon steel and low alloy steel spark source atomic emission spectrometric method (conventional method) GB/T 6394 metal average grain size determination GB/T 7736 low magnification defect ultrasonic examination of steel GB/T 10561 steel non-metallic inclusions in the content of the standard grading test microscopic examination Steel - Determination of oxygen content - Pulsed heating - Inert gas fusion - Infrared absorption method GB/T 13298 metal microstructure test method GB/T 13299 steel microstructure evaluation method GB/T 15711 steel pyramid tower acid leaching test methods GB/T 17505 steel and steel products delivery general technical requirements GB/T 17616 steel and alloy brands unified number code system GB/T 20066 Steel and iron - Determination of chemical composition of the sample sampling and sample preparation methods GB/T 20123 Steel - Determination of total carbon and sulfur content High frequency induction furnace combustion infrared absorption method (conventional method) GB/T 20125 Determination of multi-element content of low-alloy steel Inductively coupled plasma-atomic emission spectrometry GB/T 21834 Determination of multi-elemental compositional distribution of low-alloy steel in situ statistical distribution of metal analysis GB/T 22368 Determination of low-alloy steel multi-element content glow discharge atomic emission spectrometry (conventional method) Iron and steel - Determination of oxygen content YB/T 4305 Inert gas fusion - infrared absorption method YB/T 4307 Iron, steel and alloy - Determination of oxygen, nitrogen and hydrogen content - Pulsed heating - Inert gas melting - Time of flight mass spectrometry (normal method) YB/T 5293 metal forging test method

3 order content

According to this standard contract or order should include the following. a) standard number; b) product name; c) Grade or uniform number d) the weight (or quantity) of the delivery; e) size and shape; f) the use of processing methods (see 4.2); g) control residual elements (if required, see 6.1.2); h) delivery status (if required, see 6.3); i) Hardenability (see 6.5); j) Low magnification group (see 6.7); k) Non-metallic inclusions (see 6.8.2); l) special requirements (if required, see 6.10).

4 classification and code

4.1 Steel according to the steel is divided into non-alloy structural steel and alloy structural steel. 4.2 According to the use of steel processing methods into pressure processing steel (UP) and cutting steel (UC). The use of steel processing methods should be in the contract Or indicate in the order. 4.3 to ensure that the hardenability of steel code-named "H", according to the level of hardenability is divided into the reference zone (H), the upper 2/3 belt (HH), the lower 2/3 belt (HL) 40CrH, 40CrHH, 40CrHL. 4.4 for sulfur to ensure hardenability Steel in the "H" before adding "S", such as 16CrMnSH, 16CrMnSHH, 16CrMnSHL. 4.5 Steel grades unified number code according to GB/T 17616 standard. 5 size, shape, weight and tolerance 5.1 hot-rolled bar and square steel size, shape, weight and tolerances should be consistent with the provisions of GB/T 702. 5.2 hot forging round bar and square steel size, shape, weight and tolerances should be consistent with the provisions of GB/T 908. 5.3 Other dimensions, shape, weight and tolerances should be consistent with the corresponding standards or supply and demand agreement between the parties, the specific requirements should be in the contract or Specify in the order.

6 technical requirements

6.1 Grade and chemical composition 6.1.1 Steel grades, uniform number code and chemical composition (melting analysis) shall comply with the provisions of Table 1. 6.1.2 Steel residual element copper content should not exceed 0.25%, chromium content should not exceed 0.30%, nickel content should not exceed 0.30%. Hot pressing Force processing steel copper content should not exceed 0.20%. 6.1.3 steel oxygen content should not exceed 0.0020%. 6.1.4 Billet and steel products chemical composition tolerances should be consistent with the provisions of GB/T 222. 6.4.2 grades not listed in Table 2 If the delivery status of the annealed or high temperature tempering, the hardness of the delivery state of the steel by the supply and demand sides negotiated determine. 6.5 Hardenability 6.5.1 hardenability of steel by end quenching test method to determine the nominal diameter or thickness of less than 30mm of steel allowed to take in the blank Kind of measurement. In the supply and demand sides reached an agreement, the formula can also be calculated to determine the hardenability. Hardenability formula calculation method provided by To be determined by mutual agreement, you can also refer to Appendix A DI value calculation. 6.5.2 The hardenability of steel with its various points of hardness values should be consistent with Figure 2 to Figure 33 and the corresponding table, the specific requirements, see 6.6.1 Provisions. 6.5.3 Determination of hardenability The normalized temperature range, quenching temperature and allowable deviation of the sample shall comply with the provisions of the corresponding tables in Figure 2 to Figure 33. 6.5.4 Hardness of less than 20HRC is not specified. 6.6 Hardenability ordering method 6.6.1 Orders may be ordered by one of the following methods and shall be indicated in the contract. Method A. The maximum and minimum hardness at a certain distance from the quenching end, as shown in Figure 1, H band A '~ A, and H band J34/45-9. B method. a certain distance from the quenching side of the maximum and minimum hardness and another distance of a maximum hardness or minimum hardness value, as shown in Figure 1 In the H band A '~ AB (or B'), and with the H band J34/45-9 J ≤ 39-15 (or J ≥ 28-15) said. C method. from the quenching end of the two maximum and minimum hardness values, as shown in Figure 1, H band A '~ A B' ~ B, and with H with J34/45 -9 J28/39-15; Or you can order H strip A '~ AB (or B') C (or C ') and H strip J34/45-9 J≤ 39-15 (or J ≧ 28-15) J ≦ 34-25 (or J ≧ 22-25). D method. by hardenability with order. The hardenability of steel shall be supplied in accordance with the hardness values of the corresponding belts listed in the corresponding tables in Fig. 2 to Fig. 6.6.2 "B" method is the basic ordering method, if not specified, the "B" method of supply. 6.6.3 When ordering by the method of "A, B, C", the hardness value of the remaining points other than the specified point is allowed to be different from the hardenability band. 6.6.4 When ordering according to "D" method, the actual hardenability curve of the tested steel (measured according to the distance from the quenched end given in the corresponding table The hardness curve of the curve) with the hardenability of the steel to the same direction, allowing the hardness value of not more than two points deviate from the hardenability zone (Not including the 1.5mm position of the hardness value). 6.6.5 Hardenability Ordering method H belt, HH belt and HL belt with three do not. Usually H-band supply, according to demand-side requirements, and together The same note, but also by HH belt and HL belt supplier (see the specific method shown in Figure 1). 6.6.6 When the buyer proposes to order hardenability other than this standard structural steel, the chemical composition range, hardenability index, positive Fire temperature range, quenching temperature by both supply and demand sides to determine and accumulate data. 6.7 low magnification organization 6.7.1 Cross-section of steel acid leaching microstructure specimens should not be visually visible shrinkage, bubbles, cracks, inclusions, delamination, skinning and white point. For the machining of steel allows not more than Table 6 to allow the depth of subcutaneous inclusions and other surface defects. 6.7.2 acid leaching organizations shall pass the level of compliance with the provisions of Table 3, the group should be specified in the contract. Not specified when the group Ⅱ supply. 6.7.3 If the supplier can guarantee the low magnification inspection, ultrasonic testing method or other non-destructive testing method instead of acid leaching test. Table 3 low magnification level of organization Group General loose center loose ingot a center segregation b Level, not greater than I 2 2 2 2 Ⅱ 3 3 3 3 a only for die steel; b For continuous casting only. 6.8 High magnification organization 6.8.1 Steel austenite grain size of 5 or finer. 6.8.2 Steel non-metallic inclusions qualified level shall comply with the provisions of Table 4, the group should be specified in the contract. Not specified when Ⅱ group Availability. Table 4 non-metallic inclusions qualified level If the parties have different levels of requirements or need sulfur steel, the level of acceptance by the supply and demand sides to determine. 6.9 surface quality 6.9.1 For pressure processing of steel, the surface should not have cracks, scarring, folding and inclusion. If the above defects must be cleared. Clear deep Degrees from the actual size of steel counted shall comply with the provisions of Table 5. Clear width of not less than 5 times the depth of the same section to achieve the maximum depth of removal No more than one place. Allow indi......

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