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GB/T 32258-2015 English PDF (GBT32258-2015)

GB/T 32258-2015 English PDF (GBT32258-2015)

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GB/T 32258-2015: Steel cross wedge rolling -- General specification

This Standard specifies the technical requirements, test methods, inspection rules and delivery conditions of the steel cross wedge rollings.
GB/T 32258-2015
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.85
J 32
Steel cross wedge rollings - General specification
ISSUED ON. DECEMBER 10, 2015
IMPLEMENTED ON. JULY 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the PEOPLE Republic of China;
Standardization Administration of the PEOPLE Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Requirements ... 5
4 Test methods ... 7
5 Inspection rules ... 8
6 Delivery conditions ... 8
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard was proposed by and shall be under the jurisdiction of the National Technical Committee for Standardization of Forging and Pressing (SAC/TC 74).
Drafting organizations of this Standard. USTB Jixiang Science and Technology Co., Ltd, Hebei Dong?€?an Precision Manufacturing Co., Ltd, Beijing Research Institute of Mechanical and Electrical Technology, and University of Science and Technology Beijing.
Main drafters of this Standard. Zhang Jungai, Zhang Kangsheng, Jin Hong, Liu Bo, Li Yu, Ren Rongwen and Chen Wenjing.
Steel cross wedge rollings - General specification
1 Scope
This Standard specifies the technical requirements, test methods, inspection rules and delivery conditions of the steel cross wedge rollings.
This Standard is applicable to the hot-rolled steel parts produced on the cross wedge rolling mills.
2 Normative references
The following documents are essential to the application of this document. For dated references, only the editions with the dates indicated are applicable to this document. For undated references, only the latest editions (including all the amendments) are applicable to this document.
GB/T 226 Test method for macrostructure and defect of steel by etching
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1. Test method GB/T 699 Quality carbon structural steels
GB/T 700 Carbon structural steels
GB/T 702-2008 Hot-rolled steel bars - Dimensions, shape, weight and
tolerance
GB/T 1979 Grading diagrams for macrostructure and defect of structural
steels
GB/T 3077 Alloy structure steels
GB/T 4162 Forged and rolled steel bars - Method for ultrasonic testing
GB/T 5216 Structural steels with specified hardenability bands
GB/T 6394 Metal-methods for estimating the average grain size
GB/T 10561-2005 Steel - Determination of content of nonmetallic inclusions - Micrographic method using standards diagrams
GB/T 13298 Inspection methods of microstructure for metals
3.2.8 Besides the requirements of Sections 3.2.1 to 3.2.7, the steels in use can also be determined after consultation between supplier and demander. 3.3 Quality of the cross wedge rollings
3.3.1 Surface defects
3.3.1.1 The depths of the surface defects on the cross wedge rollings shall not exceed 1/3 of the actual machining allowance. However, the creases and cracks on the non-machined surfaces shall be cleaned away. The surfaces to be cleaned shall be conducted with smooth transition. The grinding width shall not be less than 6 times the depth. The length shall be 3mm above the defect length at both ends. The grinding depth shall not exceed 1/3 of the actual deviation.
3.3.1.2 The flaw detection of the surface cracks shall be conducted according to GB/T 15822.
3.3.2 Internal quality
3.3.2.1 The ultrasonic flaw detection can be conducted according to GB/T 4162. The quality level shall be greater than or equal to Level B.
3.3.2.2 There shall be no over-burning, macroscopic cracks and visible holes. 3.3.2.3 The center porosity shall be less than or equal to Level 3, and shall be evaluated according to GB/T 1979.
3.3.3 Heat treatment
3.3.3.1 General requirements
Heat treatment shall be carried out as required by the customer. The delivery statuses of the heat treatment are as follows.
a) normalizing;
b) isothermal normalizing;
c) control cooling;
d) no heat treatment.
3.3.3.2 Hardness
The hardness shall be in accordance with JB/T 11761. If not specified in JB/T 11761, IMPLEMENT according to the following requirements.

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