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ICS 77.140.20 H 40 NATIONAL STANDARD OF PEOPLES REPUBLIC OF CHINA GB/T 3077-1999Alloy structure steelsIssued on 11/01/1999 Implemented on 08/01/2000Issued by the National Quality & Technical Supervision BureauNATIONAL STANDARD OF PEOPLES REPBLIC OF CHINA GB/T 3077-1999Alloy structure steels instead of GB/T 3077-19881 SCOPEThis standard defines size, shape, weight and allowable tolerance, technical requirement, test method, check and acceptance regulations, packing, mark and quality certificate etc. of hot-rolled and forged alloy structure steels.This standard is suitable for alloy structure steel bars with diameters or thickness not larger than 250 mm. Those steel bars with diameters or thickness larger than 250 mm can also be supplied after negotiation by both supplier and customerThe chemical content of brands defined by this standard is also suitable for steel ingot, billet and their products.2 APPLICABLE DOCUMENTS GB/T 222-1984 Sampling method for analysis of chemical content of steel and allowable tolerance of chemical content of end product GB/T 224-1984 Measuring method of depth of decarbonizing layer of steel GB/T 225-1988 Test method of quench of hardenability end of steel GB/T 226-1991 Acid-etching check method of low power organization and defect of steel GB/T 228-1987 Test method of tension of metal GB/T 229-1994 Test method of Charpy shock of metal (U-shape notch) GB/T 231-1984 Test method of Brinell Hardness of metal GB/T 233-1982 Test method of upset forging of metal GB/T 702-1986 Size, shape, weight and allowable tolerance of hot-rolled round and square steel GB/T 908-1987 Size, shape, weight and allowable tolerance of forged round and square steel GB/T 1979-1980 Graded scheme of low power organization and defects of structured steel GB/T 2101-1989 General stipulations for check and acceptance, packing, mark and quality certificate of profiled steel GB/T 2975-1998 Sampling location and sample making of mechanics feature test of steels and steel product GB/T 4336-1984 Photoelectric emission spectrum analysis method of carbon steel and middle and low alloy steel GB/T 6397-1986 Test sample of tension of metal GB/T 7736-1987 Supersonic check and acceptance method of low power organization and defects of steel GB/T 10561-1989 Microscopic appraisal method of non-metal inclusion in steels GB/T 13299-1991 Microscopic organization appraisal method of steel GB/T 15711-1995 Acid-etching check and acceptance method of tower hair crack of steels GB/T 17505-1998 General technical conditions of delivery of steel and steel product GB/T 17616-1998 Unified digit code of brands of steel iron and alloy products YB/T 5148-1993 Measuring method of average grain-size of metalCited standards of chemical analysis method of various elements in steel are shown on Appendix A (Appendix of Standard) 3 CONTENTS OF ORDERContract or order according to this standard should cover following items:a) Standard numbering;b) Name of product;c) Brand or unified digit code;d) Controlled remaining elements (see 6.1.1.2 if needed);e) Weight (quantity) of delivery;f) Sizes and shape;g) Processing method;h) Delivery state;i) Delivery in heat treatment state (see 6.4 if needed);j) Hot upset forging (see 6.7 if needed);k) Decarbonizing layer (see 6.8 if needed);l) Non-metal inclusion (see 6.9 if needed);m) Special requirement (see 6.10 if needed).4 CLASSIFICATION AND CODE4.1 Steels are divided into three categories depending on metallurgical quality as follows:a) Top-quality steel;b) High grade top-quality steel (add “A” after brand);c) Special top-quality steel (add “E” after brand).4.2 Steels are divided into two categories depending on usage and processing. Usage and processing methods of steels should be noted in contract. Those without notation should be referred as steel used for cutting processing.a) Steel used for press processing UP1) Hot press processing UHP2) Steel for upset forging UF3) Billet for cold drawing UCD b) Steel used for cutting processing UC5 SIZE, SHAPE, WEIGHT AND ALLOWABLE TOLERANCE5.1 Sizes, shapes, weight and allowable tolerance of hot-rolled round and square steels should be in accord with stipulations of GB/T 702. Detailed requirements should be noted in contract.5.2 Sizes, shapes, weight and allowable tolerance of forged round and square steels should be in accord with stipulations of GB/T 908. Detailed requirements should be noted in contract.5.3 Sizes, shapes, weight and allowable tolerance of other sectional shape of steels should be in accord with corresponding standard or agreement made by both supplier and customer. Detailed requirements should be noted in contract.6 TECHNICAL REQUIREMENTS6.1 Brand and chemical content6.1.1 Brand, unified digit code and chemical content (smelting analysis) of steels should be in accord with stipulations in Table 1.6.1.1.1 Contents of sulfur, phosphate and remaining copper, chrome, nickel, molybdenum in steel should be in accord with stipulations in Table 2.GBTABLE 1Steel groupNo.Unified digit codeBrandChemical contents, %CSiMnCrMoNiWBAlTiVMn1A0020220Mn20.17-0.240.17-0.371.40-1.802A0030230Mn20.27-0.340.17-0.371.40-1.803A0035235Mn20.32-0.390.17-0.371.40-1.804A0040240Mn20.37-0.440.17-0.371.40-1.805A0045245Mn20.42-0.490.17-0.371.40-1.806A0050250Mn20.47-0.550.17-0.371.40-1.80MnV7A0120220MnV0.17-0.240.17-0.371.30-1.600.07-0.12SiMn8A1027227SiMn0.24-0.321.10-1.401.10-1.409A1035235SiMn0.32-0.401.10-1.401.10-1.4010A1042242SiMn0.39-0.451.10-1.401.10-1.40SiMnMoV11A1420220SiMn2MoV0.17-0.230.90-1.202.20-2.600.30-0.400.05-0.1212A1426225SiMn2MoV0.22-0.280.90-1.202.20-2.600.30-0.400.05-0.1213A1437237SiMn2MoV0.33-0.390.60-0.901.60-1.900.40-0.500.05-0.12B14A7040240B0.37-0.440.17-0.370.60-0.900.0005-0.003515A7045245B0.42-0.490.17-0.370.60-0.900.0005-0.003516A7050250B0.47-0.550.17-0.370.60-0.900.0005-0.0035MnB17A7140240MnB0.37-0.440.17-0.371.10-1.400.0005-0.003518A7145245MnB0.42-0.490.17-0.371.10-1.400.0005-0.0035MnMoB19A7220220MnMoB0.16-0.220.17-0.370.90-1.200.20-0.300.0005-0.0035MnVB20A7315215MnVB0.12-0.180.17-0.371.20-1.600.0005-0.00350.07-0.1221A7320220MnVB0.17-0.230.17-0.371.20-1.600.0005-0.00350.07-0.1222A7340240MnVB0.37-0.440.17-0.371.10-1.400.0005-0.00350.05-0.10MnTiB23A7420220MnTiB0.17-0.240.17-0.371.30-1.600.0005-0.00350.04-0.1024A7425225MnTiBRE0.22-0.280.20-0.451.30-1.600.0005-0.00350.04-0.10TABLE 1 (Continued)Steel groupNo.Unified digit codeBrandChemical contents, %WBAlTiVCr25A2015215Cr0.12-0.180.17-0.370.40-0.700.70-1.0026A2015315CrA0.12-0.170.17-0.370.40-0.700.70-1.0027A2020220Cr0.18-0.240.17-0.370.50-0.800.70-1.0028A2030230Cr0.27-0.340.17-0.370.50-0.800.80-1.1029A2035235Cr0.32-0.390.17-0.370.50-0.800.80-1.1030A2040240Cr0.37-0.440.17-0.370.50-0.800.80-1.1031A2045245Cr0.42-0.490.17-0.370.50-0.800.80-1.100.07-0.1232A2050250Cr0.47-0.540.17-0.370.50-0.800.80-1.10CrSi33A2138238CrSi0.35-0.431.00-1.300.30-0.601.30-1.60CrMo34A3012212CrMo0.08-0.150.17-0.370.40-0.700.40-0.700.40-0.5535A3015215CrMo0.12-0.180.17-0.370.40-0.700.80-1.100.40-0.5536A3020220CrMo0.17-0.240.17-0.370.40-0.700.80-1.100.15-0.2537A3030230CrMo0.26-0.340.17-0.370.40-0.700.80-1.100.15-0.2538A3030330CrMoA0.26-0.330.17-0.370.40-0.700.80-1.100.15-0.2539A3035235CrMo0.32-0.400.17-0.370.40-0.700.80-1.100.15-0.2540A3042242CrMo0.38-0.450.17-0.370.50-0.800.90-1.200.15-0.25CrMoV41A3112212CrMoV0.08-0.150.17-0.370.40-0.700.30-0.600.25-0.350.15-0.3042A3135235CrMoV0.30-0.380.17-0.370.40-0.701.00-1.300.20-0.300.10-0.2043A3113212Cr1MoV0.08-0.150.17-0.370.40-0.700.90-1.200.25-0.350.15-0.3044A3125325Cr2MoVA0.22-0.290.17-0.370.40-0.701.50-1.800.25-0.350.15-0.3045A3126325Cr2Mo1VA0.22-0.290.17-0.370.50-0.802.10-2.500.90-1.100.30-0.50CrMoAl46A3338238CrMoAl0.35-0.420.20-0.450.30-0.601.35-1.650.15-0.250.70-1.10CrV47A2340240CrV0.37-0.440.17-0.370.50-0.800.80-1.100.10-0.2048A2350350CrVA0.47-0.540.17-0.370.50-0.800.80-1.100.10-0.20TABLE 1 (Continued)Steel groupNo.Unified digit codeBrandChemical contents, %CSiMnCrMoNiWBAlTiVCrMn49A2215215CrMn0.12-0.180.17-0.371.10-1.400.40-0.7050A2220220CrMn0.17-0.230.17-0.370.90-1.200.90-1.2051A2240240CrMn0.37-0.450.17-0.370.90-1.200.90-1.80CrMnSi52A2420220CrMnSi0.17-0.230.90-1.200.80-1.100.80-1.1053A2425225CrMnSi0.22-0.280.90-1.200.80-1.100.80-1.1054A2430230CrMnSi0.27-0.340.90-1.200.80-1.100.80-1.1055A2430330CrMnSiA0.28-0.340.90-1.200.80-1.100.80-1.100.07-0.1256A2435335CrMnSiA0.32-0.391.10-1.400.80-1.101.10-1.40CrMnMo57A3420220CrMnMo0.17-0.230.17-0.370.90-1.201.10-1.400.20-0.3058A3440240CrMnMo0.37-0.450.17-0.370.90-1.200.90-1.200.20-0.30CrMnTi59A2620220CrMnTi0.17-0.230.17-0.370.80-1.101.00-1.300.04-0.1060A2630230CrMnTi0.24-0.320.17-0.370.80-1.101.00-1.300.04-0.10CrNi61A4020220CrNi0.17-0.230.17-0.370.40-0.700.45-0.751.00-1.4062A4040240CrNi0.37-0.440.17-0.370.50-0.800.45-0.751.00-1.4063A4045245CrNi0.42-0.490.17-0.370.50-0.800.45-0.751.00-1.4064A4050250CrNi0.47-0.540.17-0.370.50-0.800.45-0.751.00-1.4065A4112212CrNi20.10-0.170.17-0.370.30-0.600.60-0.901.50-1.9066A4212212CrNi30.10-0.170.17-0.370.30-0.600.60-0.902.75-3.1567A4220220CrNi30.17-0.240.17-0.370.30-0.600.60-0.902.75-3.1568A4230230CrNi30.27-0.330.17-0.370.30-0.600.60-0.902.75-3.1569A4237237CrNi30.34-0.410.17-0.370.30-0.601.20-1.603.00-3.5070A4312212Cr2Ni40.10-0.160.17-0.370.30-0.601.25-1.653.25-3.6571A4320220Cr2Ni40.17-0.230.17-0.370.30-0.601.25-1.653.25-3.65TABLE 1 (Continued)Steel groupNo.Unified digit codeBrandChemical contents, %CSiMnCrMoNiWBAlTiVCrNiMo72A5020220CrNiMo0.17-0.230.17-0.370.60-0.950.40-0.700.20-0.300.35-0.7573A5040340CrNiMoA0.37-0.440.17-0.370.50-0.800.60-0.900.15-0.251.25-1.65CrMnNiMo74A5018318CrNiMnMoA0.15-0.210.17-0.371.10-1.401.00-1.300.20-0.301.00-1.30CrNiMoV75A5145345CrNiMoVA0.42-0.490.17-0.370.50-0.800.80-1.100.20-0.301.30-1.800.10-0.20CrNiW76A5218318Cr2Ni4WA0.13-0.190.17-0.370.30-0.601.35-1.654.00-4.500.80-1.2077A5225325Cr2Ni4WA0.21-0.280.17-0.370.30-0.601.35-1.654.00-4.500.80-1.20 Note:1. This standard defines that the brand with mark “A” can only be ordered as high grade top-quality steels, other brands can be ordered as top quality steels.2. Depending on customers requirement, all brands in the table can be ordered as high grade top-quality steels (those without “A”) or special top-quality steels (all brands) by adding mark “A” or “B” after the brand which is ordered (delete “A” first for those brands with “A”). Other requirement put forward by customers for chemical contents of brands in the table can be ordered as special requirement. 3. Unified digit codes are listed according to stipulations of GB/T 17616, in which last digit “2” means top-quality steel, “3” means high grade top-quality steel (with “A”) and “6” means special top-quality steel (steels with “E”).4. Rare-earth contents are added in with 0.05% of counting amounts. Results of product analysis are for reference.6.1.1.2 Remaining tungsten, vanadium, titanium in steel should be made analysis and recorded results in quality certificate. Content of Remaining tungsten, vanadium, titanium can be restricted according to customers requirement.6.1.1.3 Content of copper in steel for hot press processing should not be larger than 0.20%. TABLE 2Categories of steelsPSCuCrNiMnNot larger thanTop-quality steel0.0350.0350.300.300.300.15High grade top-quality steel0.0250.0250.250.300.300.10Special top-quality steel0.0250.0150.250.300.300.106.1.2 Allowable tolerance of chemical content in steels (billet) should be in accord with stipulations in GB/T 222.6.2 Smelting methodSmelting method can be selected by manufacturers themselves except stipulations is written in contract otherwise.6.3 Delivery stateNormally steels are delivered in hot-rolled or forged state. They can be also delivered in heat treatment state (annealing, normalizing or high temperature tempering) if customers require (noted in contract).Round steel for press processing can be delivered after turning, skin-peeling off or other refine finish depending on agreement by both supplier and customer.6.4 Mechanics features6.4.1 The results of longitudinal mechanics features and hardness of tempering or high temperature annealing state of steels measured from steels made by billet after heat treatment should be in accord with stipulations in Table 3.6.4.1.1 When sizes of steels are less than that of sampling billet, steels with original sizes should be used to conduct heat treatment. Those round steels with diameter less than 16 mm and those square and flat steels with thickness not larger than 12 mm should not be conducted shock test.6.4.2 Mechanics features listed in Table 3 are suitable for steels with sectional sizes not larger than 80 mm. For those sizes larger than 80 to 100 mm, their elongation rate after breakage, section shrinkage rate and shock-absorbing power are allowed to be reduced 1% (absolute value), 5% (absolute value) and 5% respectively compared with stipulations in Table 3. Those sizes larger than 100 to 150 mm, their elongation rate after breakage, section shrinkage rate and shock-absorbing power are allowed to be reduced 2% (absolute value) 10% (absolute value) and 10%respectively. Those size larger than 150 to 250mm, their elongation rate after breakage, section shrinkage rate and shock-absorbing power are allowed to be reduced 3%(absolute value), 15% (absolute value) and 15% respectively.6.4.3 Steels which sizes are larger than 80 mm can be sampled after re-forging (rolling) its sampling blank into one with section of 70 to 80 mm, and results of check should be in accord with stipulations in Table 3. 6.4.4 For steels delivered in quenching or tempering state, samples used for checking mechanics features should not be conducted heat treatment according to customers require. Indices of mechanics features can be defined by both supplier and customer after negotiation.TABLE 3Group of steelNo.BrandSize of sampling billetmmHeat treatmentMechanics featuresHB at anneal. or high temp. tempering state HB 100/3000not larger thanQuenchingAnnealingTensile strengthbMpabYieldingPointsMPasElong.rate after break5%Shrink.rate of section%Shock absorbabsorb. Power Aku2J Heating temp. CcoolantHeating temp. Coolant1stquench.2ndquench. not less thanMn120Mn215850-Water, oil200Water, air785590104047187880-Water, oil440Water, air230Mn225840-Water500Water785635124563207335Mn225840-Water500Water835685124555207440Mn225840-Water, oil540Water885735124555217545Mn225840-Oil550Water, oil885735104547217650Mn225820-Oil550Water, oil93078594039229MnV720MnV15880-Water, oil200Water, air785590104055187SiMn827SiMn25920-Water450Water, oil980835124039217935SiMn25900-Water570Water, oil8857351545472291042SiMn25880-Water590Water885735154047229SiMnMoV1120SiMn2MoVSampling900-Oil200Water, air1380-1045552691225SiMn2MoVSampling900-Oil200Water, air1470-1040472691337SiMn2MoV25870-Water, oil650Water, air980835125063269B1440B25840-Water550Water7856351254552071545B25840-Water560Water8356851245472171650B25840-Oil600Air785540104539207MnB1740MnB25850-Oil500Water, oil9807851045472071845MnB25840-Oil500Water, oil103083594039217TABLE 3 (Continued)Group of steelNo.BrandSize of sampling billetmmHeat treatmentMechanics featuresHB at anneal. or high temp. tempering state HB 100/3000not larger thanQuenchingAnnealingTensilestrengthbMPaMPaYielding point5MPaElong. Rate after break5%Shrink. rateof section%Shock absorbpowerAku2JHeating temp. CcoolantHeating temp. oCCoolant1stquench.2ndquench.Not less thanMnMoB1920MnMoB15880Oil2000Oil, air1080885105055207MnVB2015MnVB15860Oil200Water, air8856351045552072120MnVB15860-Oil200Water, air10808851045552072240MnVB25850-Oil520Water, oil980785104547207MnTiB2320MnTiB15860-Oil200Water, air11309301045551872425MnTiBRESampling860-Oil200Water, air1380-104047229Cr2515Cr15880780-820Water, oil200Water, air7354901145551792615CrA15880770-820Water, oil180Oil, air6854901245551792720Cr15880780-820Water, oil200Water, air8355401040471792830Cr25860-Oil500Water, oil8856851145471872935Cr25860-Oil500Water, oil93073511454720
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