GB/T 3077-1999 Alloy structural steel

This standard specifies the dimensions, shape, weight and tolerances, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of hot-rolled and forged alloy structural steel. This standard applies to alloy structural steel bars with a diameter or thickness not exceeding 250 mm. Upon negotiation between the supplier and the buyer, alloy structural steel bars with a diameter or thickness exceeding 250 mm may also be supplied. The chemical composition of the grades specified in this standard also applies to steel ingots, billets and their products. GB/T 3077-1999 Alloy Structural Steel GB/T3077-1999 Standard download decompression password: www.bzxz.net

GB/T 3077—1999
This standard has revised GB/T3077—1988 "Technical Conditions for 8% Alloy Structural Steel". This revision has modified the following technical contents: the name of the standard has been changed to "alloy structural steel"; bars larger than 250mm can be provided after consultation between the supply and demand parties; a chapter on "ordering contents" has been added:
Unified digital codes for marking codes and grades of steel products have been added: - 5 grades including 30Mn2MoW, 20Mn2B, 20SiMnVB, 20Cr3MoWVA and 20CrV have been deleted, and 18CrMnNiMoA developed by my country's Baixing has been added;
The upper limit of the residual content has been added;
3.1.1. 3.3.1.1. 5, 3.5.2.1 and 3.5.2.2 in the original standard have been cancelled. Article;-The heat treatment process and heat treatment parameters of individual grades in Table 3 have been appropriately adjusted. This standard replaces GB/T3077-1988 "Technical Conditions for Alloy Structural Steel" from the date of implementation. This standard is proposed by the State Metallurgical Industry Bureau. This standard was issued by the National Steel Standardization Technical Committee. The main drafting units of this standard are: Dazhi Special Steel Co., Ltd., Information Standards Research Institute of the Ministry of Metallurgy, and Shanghai Steel (Group) Co., Ltd.
The main drafters of this standard are: Fang Jun, Liu Yide, Luan, Han Guoliang, and Chen Changxi. This standard was first issued in May 1982 and revised for the first time in February 1988. 1 Scope
National Standard of the People's Republic of China
Alloy structure steels
Alloy structure steels
GB/T3077-1999
Replaces GR/T3077-1988
This standard specifies the dimensions, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of hot-rolled and forged alloy structure steels. This standard applies to alloy structure steel bars with a diameter or thickness of less than 250mm. Upon negotiation between the supplier and the buyer, alloy structure steel bars with a diameter or thickness greater than 250mm can also be supplied. The chemical composition of the grades specified in this standard also applies to steel ingots, steel bars and their products. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of this standard, the versions shown are valid. All standards are subject to revision, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 222—1984
GB/T224—1984
GB/T 225-1988
GB/T 2261991
GB/T228—1987
GB/T 229—1994
GB/T 231—1984
GB/T 233 ---1982
GB/T702—1986
GB/T 908 1987
GB/T1979—1980
GB/T 2101-—1989
GB/T2975-1998
GB/T 4336—1984
GB/T 6397—1986
GB/T 7736—1987
CB/T 10561
GB/T 13299
Method for sampling samples for chemical analysis of steel and allowable deviation of chemical composition of finished productsDetermination of the depth of decarburized layer in steel
Test method for end-fire hardenability of steel
Test method for macrostructure and defects of steel by acid etchingMethod for metal tensile testing
Method for Charpy notched impact testing of metal
Method for Brinell hardness testing of metal
Method for metal upsetting testing
Dimensions, shapes, weights and allowable deviations of hot-rolled round steel and forging steelDimensions, shapes, unit quantities and allowable deviations of forged round steel and square steelGrading chart for macrostructure defects of structural steel
General provisions for acceptance, packaging, marking and quality certificate of steel sectionSampling position and preparation of samples for mechanical properties test of steel and steel productsPhotoelectric emission spectrum analysis method for carbon steel and medium and low alloy steelMetal tensile test sample
Ultrasonic inspection method for macrostructure and defects of steel1989
GB/T 15711-1995
GB/T 17505-1998
GB/T 17616—1998
YB/T 5148-1993
Method for microscopic evaluation of non-metallic inclusions in steel Method for evaluation of microscopic weave of steel
Test method for pyramidal hairline in steel by acid leaching
General technical delivery conditions for steel and steel products
Unified digital codes for grades of iron and alloy products Method for determination of average grain size of metals
For the referenced standards of chemical analysis methods for various elements in the above, see Appendix A (Appendix to the Standard)Approved by the State Administration of Quality and Technical Supervision on November 1, 1999, and implemented on January 1, 2000
3 Contents of the Subscription
GB/T 3077 -- 1999
The contract or order for ordering according to this standard shall include the following contents: a) Standard number:
b) Product name;
c) Brand or unified digital code:
d) Controlled residual elements (if required, see 6.1.1.2); ) Delivery weight (quantity)
}) Dimensions and shape;
) Addition method:
h) Delivery status
1) Delivery in processed state (if required, see 6.4); ) Hot top (if required, see 6.7)
k) Decarburized layer (if required, see 6.8); 1) Non-metallic inclusions (if required, see 6.9); m) Special requirements (if required, see 6.10). 4 Classification and code
4.1 Steel is divided into the following three categories according to different metallurgical qualities: a) high-quality steel;
b) high-grade high-quality steel (add \A\ after the brand), e) special high-quality steel (add \E\ after the brand).
4.2 Steel is divided into the following two categories according to different uses and processing purposes. The use and processing methods of steel materials should be indicated in the contract. If not indicated, it shall be cut and processed steel.
a) Steel for force processing UP
Hot pressure processing
2) Steel for upsetting UF
3) Cold-drawn shrimp material UCU
b) Cutting processing fat steel UC
5 Dimensions, shape, weight and allowable deviation
5.1 The dimensions, shape, weight and allowable deviation of hot-rolled round steel and steel shall comply with the relevant provisions of GB/T702. The specific requirements shall be specified in the contract.
5.2 The size, shape, weight and allowable deviation of forged round steel and square steel shall conform to the relevant provisions of GB/908. The specific requirements shall be indicated in the contract.
5.3 The size, shape, weight and allowable deviation of steel with other cross-sectional shapes shall conform to the relevant standards or the provisions agreed upon by the supply and demand parties. The specific requirements shall be indicated in the contract.
6 Technical requirements
6.1 Grade and chemical composition
6.1.1 The grade of steel (unified digital code and chemical composition (melting analysis)) shall conform to the provisions of Table 1. 6.1.1.1 The content of bowl, magnet and residual copper, nickel and pin in steel shall conform to the provisions of Table 2. 6.1.1.2 The residual tungsten, vanadium and titanium content in the steel shall be analyzed: the results shall be recorded in the quality certificate. According to the requirements of the purchaser, the residual tungsten, vanadium and titanium content may be analyzed. Titanium 1999
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GB/T3077-1999
6.1.1.3Hot pressure steel copper content is not more than 0.20%Table 2
High quality Pot
High-grade steel
Special-grade steel
Wood greater than
6.1.2 The allowable deviation of the chemical composition of sawn (or broken) shall be in accordance with the provisions of GB/T 222 ：6.2 Refining method
Unless otherwise specified in the contract, the smelting method shall be selected by the manufacturer. 6.3 Delivery status
The steel is usually delivered in the hot-rolled or hot-forged state. If the purchaser requires (and specifies in the contract), it can also be delivered in the heat-treated (annealing, normalizing or high-temperature tempering) state
According to the agreement between the supplier and the purchaser, the round steel for pressure processing can be delivered after turning, peeling or other finishing methods. 6.4 Mechanical properties
6.4.1 The longitudinal mechanical properties of the steel and the hardness of the annealed or high-temperature tempered state are measured by making the specimens from the heat-treated rough pieces. The test results shall comply with the provisions of Table 3.
6.4.1.1 When the size of the steel is smaller than the size of the test rough pieces, the original size steel shall be used for heat treatment. Round steel with a diameter less than 16 mm and square steel and flat steel with a thickness not greater than 12 mm shall not be subjected to impact test. 6.4.2 The mechanical properties listed in Table 3 are applicable to steel with a cross-sectional size not greater than 80 mm. For steel products with a size of 80 to 100 mm, the elongation after fracture, the reduction of cross-sectional area and the impact absorbed energy are allowed to be reduced by 1% (absolute value), 5% (absolute value) and 5% respectively compared with the provisions in Table 3; for steel products with a size of 100 to 150 mm, the elongation after fracture, the reduction of cross-sectional area and the impact absorbed energy are allowed to be reduced by 2% (absolute value), 10% (absolute value) and 10% respectively; for steel products with a size of 150 to 250 mm, the elongation after fracture, the reduction of cross-sectional area and the impact absorbed energy are allowed to be reduced by 3% (absolute value), 15% (absolute value) and 15% respectively. 6.4.3 For steel products with a size of 80 mm or more, the sampling is allowed to be forged (rolled) into a cross-section of 70 to 80 mm and then sampled: The test results shall comply with the provisions of Table 3.
6.4.4 According to the requirements of the purchaser, the steel delivered in the quenched and tempered state shall not be heat treated for the test specimens used to determine the mechanical properties, and the mechanical properties shall be agreed upon by the supply and demand parties. 6.5 Macrostructure
6.5. There shall be no visible shrinkage, bubbles, cracks, inclusions, white spots, or cracks on the cross-sectional acid-impregnated macrostructure test piece of the steel.
6.5.2 The acid-impregnated macrostructure level shall comply with the provisions of Table 4. 6.5.2.1 The general pitting segregation and edge pitting segregation of 38CrMaAl or 38CrMoAIA steel shall not exceed 2.5 and 1. 5 level.
6.5.2.2 The steel used for cutting is allowed to have subcutaneous impurities, subcutaneous bubbles and other defects that do not exceed the allowable depth of surface defects. 6.5.2.3 If the supplier can ensure that the low-power inspection is qualified, ultrasonic inspection or other non-destructive testing methods can be used instead of digital immersion low-power inspection. 6.6 Surface quality
6.6.1 The surface of the pressure-added steel shall not have cracks, scars, folds and inclusions. If there are any above defects, they must be removed. The removal depth shall comply with the provisions of Table 5 from the actual size of the steel. The removal width shall not be less than 5 times the depth, and the maximum removal depth shall not be reached more than 1 place per section. Individual fine scratches, indentations, pits and small cracks with a detection depth of no more than 0.2mm that do not exceed the minimum tolerance of the actual size are allowed.
GB/T 3077—1999
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