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GB/T 33084-2016 PDF in English

GB/T 33084-2016 (GB/T33084-2016, GBT 33084-2016, GBT33084-2016)
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GB/T 33084-2016: PDF in English (GBT 33084-2016)

GB/T 33084-2016
ICS 77.140.85
J 32
Heavy Alloy Structural Forgings – Technical Specification
Issued by: General Administration of Quality Supervision, Inspection and
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Ordering Requirements ... 4
4 Manufacturing Process ... 5
4.1 Smelting ... 5
4.2 Forging ... 5
4.3 Heat treatment ... 5
4.4 Machining ... 5
4.5 Defect removal and repair welding ... 5
5 Technical Requirements ... 5
5.1 Chemical composition ... 5
5.2 Mechanical properties ... 9
5.3 Hardness ... 15
5.4 Non-destructive testing ... 15
6 Inspection Rules and Test Methods ... 15
6.1 Chemical composition analysis ... 15
6.2 Mechanical properties test ... 16
6.3 Hardness test ... 19
6.4 Retest ... 19
6.5 Reheat treatment ... 20
7 Acceptance and Quality Certificate ... 20
8 Markings and Packaging ... 21
Heavy Alloy Structural Forgings – Technical Specification
1 Scope
This Standard specifies the ordering requirements, manufacturing process, technical
requirements, inspection rules and test methods, acceptance and quality certificates, marking
and packaging of alloy structural steel forgings.
This Standard applies to the ordering, manufacture and inspection of heavy alloy structural steel
forgings for general purposes.
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) is applicable to this
GB/T 223 (all parts) Methods for Chemical Analysis of Iron, Steel and Alloy
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room
Temperature (GB/T 228.1-2010, ISO 6892-1:2009, MOD)
GB/T 229 Metallic Materials - Charpy Pendulum Impact Test Method (GB/T 229-2007,
ISO 148-1:2006, MOD)
GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1: Test Method (GB/T 231.1-
2009, ISO 6506-1:2005, MOD)
3 Ordering Requirements
3.1 The purchaser shall specify the name, grade, material designation, delivery status and
supply quantity of the forgings in the ordering contract.
3.2 The purchaser shall provide the ordering drawing.
3.3 When the purchaser has supplementary requirements, it shall be agreed upon by both parties.
4 Manufacturing Process
4.1 Smelting
Steel for forgings shall be smelted by alkaline electric furnace. With the consent of the purchaser,
other methods to ensure quality can also be used for smelting.
4.2 Forging
Forgings shall be forged from ingots or billets. There shall be enough removal at both ends of
the ingot to ensure that the forging body has no shrinkage cavity and serious segregation.
Forgings shall be forged on forging equipment with sufficient capacity to ensure forging
penetration and uniform structure. Forgings allow multiple length forging. Forgings shall be
cooled slowly after forging to prevent cracking.
4.3 Heat treatment
Forgings shall be cooled slowly by tempering at high temperature or normalizing and tempering
or by other means to improve the structure and machinability. According to the material
designation and strength grade of the forging, normalizing and tempering or quenching and
tempering heat treatment process can be used. Forgings allow multiple length heat treatment.
4.4 Machining
4.4.1 The supplier may decide on a case-by-case basis whether or not to roughen all surfaces
of the forging prior to the performance heat treatment.
4.4.2 The dimensions, tolerances and surface roughness of the delivered forgings shall comply
with the provisions of the purchaser's ordering drawing.
4.5 Defect removal and repair welding
4.5.1 Local defects of forgings can be removed, but the removal depth shall not exceed 75% of
the machining allowance.
4.5.2 For defective forgings, only after the welding evaluation results meet the mechanical
properties of the same material designation and obtaining the purchaser's approval, can be
repaired by repair welding.
5 Technical Requirements
5.1 Chemical composition
5.1.1 The supplier shall carry out smelting analysis for each furnace (each package) of molten
steel, and the analysis results shall comply with the provisions of Table 1. The weighted average
analysis results shall be reported when multiple furnaces are combined.
from the extended part (extended section or enlarged section) or the remainder of the forging. The sampling direction shall meet the following requirements:
a) For shaft, square or rectangular forgings, the direction of tensile and impact specimens
shall be the axial (longitudinal) direction;
b) For hollow cylinders, discs and annular forgings, the direction of the tensile and impact
specimens shall be tangential (circumferential direction). When the sampling location is not specified in the order drawing, the sampling can be
carried out according to the following conditions:
a) The samples of solid shaft forgings are taken from one-third of the radius from the surface;
and the samples of square and rectangular forgings are taken from one-third of the
diagonal vertex to the center (see Figure 1);
b) The samples of hollow cylinder forgings are taken from half the wall thickness (see Figure
c) For disc forgings, when sampling at the enlarged part of the outer diameter, the sample
shall be taken from the half height of the enlarged part; when sampling at the extended
part, the sample shall be taken from one third of the radius from the outer edge at or at
least 20mm from the edge (see Figure 3);
d) For annular forgings, when sampling at the enlarged part of the outer diameter, the sample
shall be taken from the half height of the enlarged part; when sampling at the extended
part, the sample shall be taken from the half of the wall thickness (see Figure 4).
a) When the V-notch impact test is carried out, if the test results of a group of impact samples
are unqualified, another group of three specimens can be taken from the adjacent parts
of the original specimen for retesting, and the arithmetic mean of the two groups of
samples before and after shall be no lower than the specified requirements; and the
number of single values lower than the specified value shall be no more than two, and
only one single value is allowed to be lower than 70% of the specified value;
b) When the U-notch impact test is carried out, if a test result is unqualified, double samples
can be taken from the adjacent parts of the original sample for retesting, and the retest
results of both samples shall meet the requirements.
6.4.3 If the mechanical property test fails due to white spots and cracks in the sample, it shall
not be retested.
6.5 Reheat treatment
When any mechanical property test result of the forging is still unqualified, re-heat treatment
can be carried out, and re-sampling test can be carried out. The number of re-heat treatment
shall be no more than twice, and the number of tempering shall be unlimited.
7 Acceptance and Quality Certificate
7.1 The purchaser has the right to select certain test items of the forgings for acceptance. During
the acceptance inspection or subsequent processing or inspection, the purchaser shall notify the
supplier in time when it is found that the forging does not meet the supplementary technical
requirements specified in this Standard and the ordering contract. the two parties shall negotiate
a settlement.
7.2 The supplier shall provide the purchaser with a quality certificate, which shall at least
include the following contents:
a) Contract number;
b) Forging drawing number;
c) The used standard number and material designation;
d) Smelting method, melting furnace number and forging identification number;
e) Chemical analysis report;
f) Mechanical properties test report;
g) Other inspections and supplementary inspection reports required by the purchaser;
h) Actual dimensions and weight of the delivered forgings.
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.