GB/T 5216: Evolution and historical versions
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Structural steels subject to end-quench hardenability requirements
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Technical requirements for structural steel with specified hardenability bands
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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Word Count Estimation | 50,585 | | Date of Issue | 12/5/2014 | | Date of Implementation | 9/1/2015 | | Older Standard (superseded by this standard) | GB/T 5216-2004 | | Quoted Standard | GB/T 222; GB/T 223.3; GB/T 223.5; GB/T 223.11; GB/T 223.13; GB/T 223.14; GB/T 223.16; GB/T 223.17;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 individual scratches, indentations, pockmarks and depth not to exceed half the dimensional tolerance from the actual size
0.2mm small cracks exist.
Table 5 The maximum surface allowable clearance in millimeters
Steel size allows depth removal
< 80 Steel size tolerance of 1/2
≥80 ~ 140 steel size tolerances
> 140 ~.200 steel size of 5%
>.200% of steel size 6%
6.9.2 For the machining of steel, the surface allowed from the steel nominal size does not exceed the local defects specified in Table 6.
Table 6 allowable depth of defects in millimeters
Steel size Local defects allow depth
< 100 Steel size negative deviation
≥100 steel size tolerances
6.10 special requirements
According to the requirements of the demand side, the agreement between the supply and the demand sides, and in the contract, can supply steel with the following special requirements.
a) adjust the hardenability index;
b) reduce the carbon content range;
c) increase the oxygen content;
d) test mechanical properties;
e) test hot forging performance;
f) test with a tower-shaped sample hair lines;
g) test banded tissue;
h) the specified range of alloy elements and residual elements of the specific content;
i) Other special requirements items.
7 test method
Test methods for each batch of steel according to the provisions of Table 7.
Table 7 steel inspection items, the number of samples, sampling sites and test methods
Number of test items sampling number/a sampling site test method
1 chemical composition 1/furnace GB/T 20066
GB/T 223, GB/T 4336,
GB/T 20123, GB/T 20125,
GB/T 21834, GB/T 22368
2 Oxygen content 1 billet or steel radius 1/2 or 1/4 diagonal
GB/T 11261,
YB/T 4305, YB/T 4307
3 Stretch 2 different root steel, GB/T 2975 GB/T 228.1
4 Impact 2 different root steel, GB/T 2975 GB/T 229
5 hardness 3a different root steel GB/T 231.1
6 hot upset 2 different root YB/T 5293
7 Hardenability 1 Any billet or steel GB/T 225
8 times the organization 2
Die Casting. Different billets or steels equivalent to the head of a billet
Continuous casting. different root steel
GB/T 226, GB/T 1979
9 tower 1 any one steel GB/T 15711
10 Non-metallic inclusions 2 Different billets or steels GB/T 10561
11 Grain size 1 Any steel GB/T 6394
12 Banded structure 1 Any steel GB/T 13299, GB/T 13298
13 ultrasonic testing 2
Die Casting. Different billets or steels equivalent to the head of a billet
Continuous casting. different root steel
GB/T 7736
14 by the root of the entire root steel caliper, micrometer
15 surface by root on the whole steel visual
a delivery of less than 3 steel, according to the actual number of steel hardness measurement.
8 Inspection rules
8.1 inspection and acceptance
8.1.1 Steel factory inspection and acceptance by the supplier quality and technical supervision departments.
8.1.2 The supplier must ensure that the delivered steel meets the requirements of this standard or contract, and the buyer has the right to inspect any of the steel products specified in this standard or contract
Inspection project inspection and acceptance.
8.2 group rules
Steel should be batch inspection and acceptance, each batch by the same brand, the same heat number, the same processing methods, the same size, the same delivery status, the same
Heat treatment system (furnace) steel composition.
8.3 The number of samples and sampling sites
Each batch of steel samples and sampling sites should be consistent with the provisions of Table 7.
8.4 Reinspection and judgment rules
8.4.1 Steel reinspection and determination rules According to GB/T 17505 regulations.
8.4.2 If the supplier can guarantee the qualified steel, the same number of steel or billet low magnification organizations, non-metallic inclusions and hardenability of the seizure
Test the results, allowing the blank material to big generation small.
9 packaging, marking and quality certificate
Steel packaging, marking and quality certificate should be consistent with the provisions of GB/T 2101.
Figure 1 according to the order of hardenability diagram
Appendix A.
(Informative)
Calculation method of ideal critical diameter DI of steel 1)
The critical critical diameter (DI) of steel can be calculated from the chemical composition of the steel (smelting analysis). The method is suitable for steel chemical composition (mass fraction) range.
A.1 Non-boron-containing steel
A.1.1 Calculation of chemical composition of carbon and alloying elements in Table A.1.
Table A.1 Calculations of elemental carbon and alloying elements based on chemical composition
Chemical elements of the scope (mass fraction) /% calculation factor
A.1.2 Calculate the ideal critical DI value according to equation (A.1) based on the carbon and alloying element factors.
A.2 boron-containing steel
A.2.1 calculated based on the chemical composition of the ideal critical diameter DI (not consider B element)
Calculation method with A.1.
A.2.2 Calculate the alloying factor fA according to the formula (A.2) on the basis of the ideal critical diameter DI (excluding element B) and the C-factor fC.
A.2.3 Calculate the B factor fB based on the alloying factor fA and the ideal critical diameter DI (without considering element B), see Table A.2. For other combinations
Gold factor, need interpolation met...
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