GB/T 3077-2015 PDF English
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.60
H 40
Replacing GB/T 3077-1999
Alloy Structure Steels
Issued on: DECEMBER 10, 2015
Implemented on: NOVEMBER 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Classification and code... 8
4 Ordering content... 9
5 Size, shape, weight and tolerance... 9
6 Technical requirements... 10
7 Test methods... 28
8 Inspection rules... 29
9 Packaging, marking and quality certificate... 30
APPENDIX A... 31
Foreword
This Standard is drafted in accordance with the rules specified by GB/T 1.1-
2009.
This Standard replaces GB/T 3077-1999 "alloy structure steel".
Compared with GB/T 3077-1999, the main technical changes of this Standard
are as follows.
- MODIFY the classification requirements based on metallurgical quality (see
Table 2, Table 4,6.7 and 6.8 of this version; Table 2 and Table 4 of 1999
version);
- ADJUST the lower limit of boron steel’s B content from 0.0005% to 0.0008%
(see Table 1 of this version);
- DELETE all designations with letter "A"; however, the chemical composition
of same designation is adjusted to the chemical composition of the original
designation with letter A (see Table 1 of this version; Table 1 of 1999
version);
- ADD 12 designations and related technical requirements, such as 25MnB,
35MnB, 25CrMo, 50CrMo, 34CrNi2,15CrNiMo, 30CrNiMo, 30Cr2Ni2Mo,
30Cr2Ni4Mo, 34Cr2Ni2Mo, 35Cr2Ni4Mo, 40CrNi2Mo (see Table 1 and
Table 3 of this version; Tables 1 and 3 of 1999 version);
- ADJUST the sulfur and phosphorus content of steel (Table 2 of this version;
Table 2 of 1999 version);
- SUBDIVIDE the surface defects into defect and deficiency (see 6.10 of this
version; 6.6 of 1999 version);
- MODIFY the surface quality description, and INCLUDE GB/T 28300
standard specifications (see 6.10 of this version; 6.6 of 1999 version);
- MODIFY the "nonmetallic inclusion" requirements (see 6.7 of this version;
6.9 of 1999 version);
- ADD "grain size" requirements (see 6.8 of this version);
- MODIFY "special requirements" (see 6.11 of this version; 6.10 of 1999
version);
- ADD the numerical rounding requirements (see 7.2 of this version);
- ADD the comparison table of this Standard’s designations and foreign
standard’s similar designations (see Appendix A of this version).
This Standard was proposed by the National Iron and Steel Association.
This Standard shall be under the jurisdiction of the National Steel
Standardization Technical Committee (SAC/TC 183).
The drafting organizations of this Standard. Daye Special Steel Co., Ltd., China
Metallurgical Information and Standardization Institute, Baosteel Special Steel
Co., Ltd., Shijiazhuang Iron &Steel Co., Ltd., Fujian Sanming Iron and Steel
(Group) Co., Ltd., Suzhou Suxin Special Steel Co., Ltd., Hubei Tri-ring Forging
Co., Ltd., Beijing Jiaotong University.
The main drafters of this Standard. Huang Chenggang, Li Bopeng, Luan Yan,
Dai Qiang, Zhang Shuping, Meng Ruiying, Liu Jianfeng, Bie Lifang, Hui Weijun,
Liu Ping, Shi Jibin, Sun Zhicheng, Dai Heping, Ding Hui.
This Standard replaces the standards previously issued as follows.
--- GB/T 3077-1982, GB/T 3077-1988, GB/T 3077-1999.
Alloy Structure Steels
1 Scope
This Standard specifies the classification and code, order content, size, shape,
weight and allowable tolerance, technical requirements, test method, inspection
rules, packaging, marking and quality certificate of alloy structure steel.
This Standard applies to the hot-rolled and forged alloy steel bars which are not
more than 250mm of nominal diameter or thickness. However, after negotiated
by the Supplier and Demander, it is also allowed to supply hot-rolled and forged
alloy steel bars which are more than 250mm of nominal diameter or thickness
(abbreviated as the steel bar).
The designations and chemical compositions which are specified in this
Standard are also applicable to steel ingot, billet and their products.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this Standard.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223.4 Alloyed steel - Determination of manganese content -
Potentiometric or visual titration method
GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total
silicon content - Reduced molybdosilicate spectrophotometric method
GB/T 223.9 Iron, steel and alloy - Determination of aluminum content -
Chrom azurol S photometric method
GB/T 223.11 Iron, steel and alloy - Determination of chromium content -
Visual titration or potentiometric titration method
GB/T 223.13 Methods for chemical analysis of iron, steel and alloy - The
ammonium ferrous sulfate titration method for the determination of vanadium
content
GB/T 223.16 Methods for chemical analysis of iron, steel and alloy - The
chromotropic acid photometric method for the determination of titanium
content
GB/T 223.18 Methods for chemical analysis of iron, steel and alloy - The
sodium thiosulfate separation iodimetric method for the determination of
copper content
GB/T 223.23 Iron, steel and alloy - Determination of nickel content - The
dimethylglyoxime spectrophotometric method
GB/T 223.26 Iron, steel and alloy - Determination of molybdenum content -
The thiocyanate spectrophotometric method
GB/T 223.43 Iron, steel and alloy - Determination of tungsten content -
Gravimetric method and spectrophotometric method
GB/T 223.49 Methods for chemical analysis of iron, steel and alloy -
Extraction separation - Chlorophosphonazo mA spectrophotometric method
for the determination of the total rare earth content
GB/T 223.59 Iron, steel and alloy - Determination of phosphorus content -
Bismuth phosphomolybdate blue spectrophotometric method and antimony
phosphomolybdate blue spectrophotometric method
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
GB/T 223.67 Iron, steel and alloy - Determination of sulfur content -
Methylene blue spectrophotometric method
GB/T 223.69 Iron, steel and alloy - Determination of carbon contents - Gas-
volumetric method after combustion in the pipe furnace
GB/T 223.75 Iron, steel and alloy - Determination of boron content - Methanol
distillation-curcumin photometric method
GB/T 224 Determination of depth of decarburization of steels
GB/T 225 Steel - Hardenability test by end quenching (Jominy test)
GB/T 226 Test method for macrostructure and defect of steel by etching
GB/T 228.1 Metallic materials - Tensile testing - Part 1.Method of test at
room temperature
GB/T 229 Metallic materials - Charpy notch impact test
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1.Test method
GB/T 702 Hot-rolled steel bars - Dimensions, shape, weight and tolerance
GB/T 908 Forged bars - Dimensions, shape, weight and tolerance
GB/T 1979 STANDARD diagrams for macrostructure and defect of structural
steels
GB/T 2101 General requirement of acceptance packaging marking and
certification for section steel
GB/T 2975 Steel and steel products - Location and preparation of test pieces
for mechanical testing
GB/T 4162 Forged and rolled steel bars - Method for ultrasonic testing
GB/T 4336 Standard test method for spark discharge atomic emission
spectrometric analysis of carbon and low-alloy steel (routine method)
GB/T 6394 Metal - Methods for estimating the average grain size
GB/T 6402 Steel forgings - Method for ultrasonic testing
GB/T 7736 Ultrasonic inspecting method for macro-structure and
imperfection of steel
GB/T 8170-2008 Rules of rounding off for numerical values & expression and
judgment of limiting values
GB/T 10561 Steel - Determination of content of nonmetallic inclusions -
Micrographic method using standards diagrams
GB/T 11261 Steel and iron - Determination of oxygen content - The pulse
heating inert gas fusion-infra-red absorption method
GB/T 13298 Inspection methods of microstructure for metals
GB/T 13299 Steel - Determination of microstructure
GB/T 15711 Steel products - Method for etch test of tower sample
GB/T 17505 Steel and steel products - General technical delivery
requirements
GB/T 20066 Steel and iron - Sampling and preparation of samples for the
determination of chemical composition
GB/T 20123 Steel and iron - Determination of total carbon and sulfur content
infrared absorption method after combustion in an induction furnace (routine
method)
GB/T 20124 Steel and iron - Determination of nitrogen content - Thermal
conductimetric method after fusion in a current of inert gas
GB/T 21834 Medium and low alloy steel - Determination of the distribution of
multi-element contents - Original position statistic distribution analysis
method
GB/T 28300 Surface quality classes for hot-rolled bars and rods technical
delivery conditions
YB/T 4306 Steel, iron and alloy - Determination of nitrogen content - Thermal
conductimetric method after fusion in a current of inert gas
YB/T 5293 Metallic materials - Forging test
3 Classification and code
3.1 Based on metallurgical quality, the steel bar is divided into the following
three categories.
a) Quality steel;
b) Advanced-quality steel (ADD "A" after designation);
c) Excellent-quality steel (ADD "E" after designation).
3.2 Based on application and processing method, the steel bar is divided into
the following two categories.
a) Steel for pressure processing UP;
1) Hot pressure processing UHP;
2) Upsetting steel UF;
3) Cold drawn blank UCD;
b) Cutting steel UC.
3.3 Based on surface types, the steel bar is divided into the following five
categories.
a) Pressure processing surface SPP;
b) Pickling SA;
c) Shot blasting (sand blasting) SS;
d) Stripping SF;
e) Polishing SP.
4 Ordering content
In accordance with this Standard, the order contract or order shall include the
following.
a) Standard number;
b) Product name;
c) Designations OR unified digit code;
d) Controlled residual elements (if required, see Table 2);
e) Delivery weight (or quantity);
f) Size, shape and allowable tolerance;
g) Processing method used (if not indicated, it is deemed as cutting steel);
h) Heat treatment delivery or special surface state delivery (if required, see
6.3.2 and 6.3.3);
5 Size, shape, weight and tolerance
5.1 The size, shape, weight, and allowable tolerance of hot-rolled steel bar shall
comply with the relevant provisions of GB/T 702; the specific requirements shall
be indicated in the contract.
5.2 The size, shape, weight, and allowable tolerance of hot-forged steel bar
shall comply with the relevant provisions of GB/T 908; the specific requirements
shall be indicated in the contract.
6 Technical requirements
6.1 Designation and chemical composition
6.1.1 The steel designation, unified digit code and chemical composition
(melting analysis) shall comply with the requirements in Table 1.
6.1.2 The sulfur, phosphorus and residual element contents in steel shall be in
accordance with Table 2.
6.1.3 The allowable tolerance of finished bar’s (or blank’s) chemical
composition shall comply with the provisions of GB/T 222.
6.2 Melting method
Unless otherwise specified in the contract, the smelting method is to be selected
by the manufacturer itself.
6.3 Delivery status
6.3.1 The steel bar is generally delivered under hot-rolled OR hot-forging state.
6.3.2 Based on the Demander’s requirements AND indicated in the contract, it
is also allowed to make delivery under heat treatment (annealing, normalizing
or tempering) state.
6.3.3 If it is agreed by the Demander and Supplier AND indicated in the contract,
it is allowed to deliver the steel bar with the surface polished, peeled or finished
otherwise.
6.4 Mechanical properties
6.4.1 After the sample blank is subject to the heat treatment system processing
which is recommended in Table 3, the steel bar’s measured longitudinal
mechanical properties shall comply with the requirements in Table 3.
6.4.2 The mechanical properties listed in Table 3 are applicable to the steel bars
which is not more than 80mm of nominal diameter or thickness. As for the steel
bars which are more than 80mm of nominal diameter or thickness, the
mechanical properties shall meet the following requirements.
a) As for the steel bar which is more than 80mm ~ 100mm of nominal size, it
is allowed to reduce its fractured elongation, percentage reduction of area,
and impact energy absorption for 1% (absolute value), 5% (absolute value)
and 5% respectively, as compared with Table 3;
b) As for the steel bar which is more than 100mm ~ 150mm of nominal size,
it is allowed to reduce its fractured elongation, percentage reduction of
area, and impact energy absorption for 2% (absolute value), 10%
(absolute value) and 10% respectively, as compared with Table 3;
c) As for the steel bar which is more than 150mm ~ 250mm of nominal size,
it is allowed to reduce its fractured elongation, percentage reduction of
area, and impact energy absorption for 3% (absolute value), 15%
(absolute value) and 15% respectively, as compared with Table 3;
d) It is allowed to forge (roll) the sample blank into section 70mm ~ 80mm
AND then TAKE sample. The test results shall comply with Table 3.
6.4.3 As for the steel bars which are delivered under annealing or tempering
state, the Brinell hardness shall comply with Table 3.
6.5 Hot upsetting
Based on the Demander’s requirements AND if it is indicated in the contract,
the hot-upsetting steel shall be subject to hot upsetting test, AND the sample
height after test shall be 1/3 of the original sample height, AND the sample after
upsetting shall have no cracks. As for the steel bar which is more than 80mm
of nominal size, if the Supplier can guarantee qualification, it can be exempted
from test.
7 Test methods
As for the steel bar’s test items and test methods, see Table 8.
Table 8 Test items, sampling quantity, sampling location and test
methods
No. Test item Sample amount Sampling location Test methods
8 Inspection rules
8.1 Inspection and acceptance
8.1.1 The steel bar exit-factory inspection and acceptance shall be conducted
by the quality department of the Supplier.
8.1.2 The Supplier must guarantee that the delivered bar complies with this
Standard or contract provisions. If necessary, the Demander has the right of
conducting inspection and acceptance of any test items which are specified in
this Standard or in contract.
8.2 Group-batch rules
8.2.1 The steel bar shall be checked and accepted based on batches. AND
each batch is composed of bars of same designation, same heat number, same
processing methods, same size, same delivery status, and same heat
treatment system (or heat).
8.2.2 As for the steel subject to electroslag re-melting smelting, under the
conditions of guaranteeing stable process AND each requirement of this
Standard, it is allowed to conduct batching and delivery based on the
consumable electrode melting furnace number.
8.3 Sample amount and sampling location
The sample amount and location of each batch of the steel bars shall comply
with Table 8.
9 Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel bars shall comply with
GB/T 2101.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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