GB/T 14977-2025 General requirement for surface condition of hot-rolled steel sheet and plate English, Anglais, Englisch, Inglés, えいご
General requirement for surface condition of hot-rolled steel sheet and plate
1 Scope
This document specifies the classification, requirements and rounding off for numerical values of the surface condition of hot-rolled steel sheets and plates.
This document is applicable to single-sheet hot-rolled steel sheets and plates and cut steel sheets and plates obtained by shearing hot-rolled coils, with a thickness ranging from 3mm to 400mm (hereinafter referred to as "steel sheets and plates").
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 19866 Specification and qualification of welding procedures for metallic materials - General rules (GB/T 9866-2005, ISO 15607:2003, IDT)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
imperfections
surface discontinuity other than cracks, shell and seams with a depth and/or an area equal to or less than a specified limiting value
Note: Discontinuities that are required to be repaired are regarded as defects.
3.2
defects
surface discontinuity with a depth and/or area greater than a specified limiting value and all cracks, shell and seams, irrespective of their depth or/and area
Note: See Annex C for the description of common discontinuities.
4 Classification
The surface conditions are subdivided into 2 classes (A and B). Each class is further subdivided into 3 subclasses:
Class A: The surface condition shall conform to the requirements of 5.3.1 and 5.4.1.2. The remaining thickness of the affected area under the discontinuities and of the repaired ground areas may be less than the minimum permissible thickness of the steel sheet and plate.
Class B: The surface condition shall conform to the requirements of 5.3.2 and 5.4.1.3. The remaining thickness of the affected area under the discontinuities and of the repaired ground areas shall not be less than the minimum permissible thickness of the steel sheet and plate.
Subclass 1: Repair by chipping and/or grinding followed by welding is permitted in accordance with 5.4.2.2.1.
Subclass 2: Repair by welding is only permitted in accordance with 5.4.2.2.2 if agreed by the producer and purchaser and it is specified in the contract.
Subclass 3: Repair by welding is not allowed.
Note: The classification and requirements of surface condition are shown in Table D.1 of Annex D.
When the product standard or contract does not specify the surface condition class and subclass, the class and subclass shall be class A and subclass 1.
5 Requirements
5.1 General requirement for surface condition of steel sheets and plates
Responsibility for the required surface condition, whether the product is delivered descaled or not, rests with the material producer, the producer has to take the necessary precautions. The producer can only take account of discontinuities that are visible to the naked eye. Rolling or heat-treatment scale can conceal surface discontinuities.
If the purchaser needs to be sure that all discontinuities visible to the naked eye have been identified, assessed and where necessary, repaired before delivery, products should be ordered descaled.
If, during the subsequent descaling or working operations by the user, the material is found to be defective because of faulty rolling or processing by the producer, the producer shall be given opportunity to repair the product, provided that this is not in conflict with the appropriate material or product standard.
5.2 Determination of depth and affected area of discontinuities
5.2.1 Determination of depth
Contents
Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 Requirements
6 Rounding off for numerical values
Annex A (Informative) Comparison of clause/subclause numbers between this document and ISO 7788:2021
Annex B (Informative) Technical deviations between this document and ISO 7788:2021 and their justifications
Annex C (Informative) Description of common discontinuities
Annex D (Informative) Classes and subclasses for surface conditions with their respective requirements
Standard
GB/T 14977-2025 General requirement for surface condition of hot-rolled steel sheet and plate (English Version)
Standard No.
GB/T 14977-2025
Status
valid
Language
English
File Format
PDF
Word Count
8500 words
Price(USD)
255.0
Implemented on
2026-3-1
Delivery
via email in 1 business day
Detail of GB/T 14977-2025
Standard No.
GB/T 14977-2025
English Name
General requirement for surface condition of hot-rolled steel sheet and plate
GB/T 14977-2025 General requirement for surface condition of hot-rolled steel sheet and plate English, Anglais, Englisch, Inglés, えいご
General requirement for surface condition of hot-rolled steel sheet and plate
1 Scope
This document specifies the classification, requirements and rounding off for numerical values of the surface condition of hot-rolled steel sheets and plates.
This document is applicable to single-sheet hot-rolled steel sheets and plates and cut steel sheets and plates obtained by shearing hot-rolled coils, with a thickness ranging from 3mm to 400mm (hereinafter referred to as "steel sheets and plates").
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 19866 Specification and qualification of welding procedures for metallic materials - General rules (GB/T 9866-2005, ISO 15607:2003, IDT)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
imperfections
surface discontinuity other than cracks, shell and seams with a depth and/or an area equal to or less than a specified limiting value
Note: Discontinuities that are required to be repaired are regarded as defects.
3.2
defects
surface discontinuity with a depth and/or area greater than a specified limiting value and all cracks, shell and seams, irrespective of their depth or/and area
Note: See Annex C for the description of common discontinuities.
4 Classification
The surface conditions are subdivided into 2 classes (A and B). Each class is further subdivided into 3 subclasses:
Class A: The surface condition shall conform to the requirements of 5.3.1 and 5.4.1.2. The remaining thickness of the affected area under the discontinuities and of the repaired ground areas may be less than the minimum permissible thickness of the steel sheet and plate.
Class B: The surface condition shall conform to the requirements of 5.3.2 and 5.4.1.3. The remaining thickness of the affected area under the discontinuities and of the repaired ground areas shall not be less than the minimum permissible thickness of the steel sheet and plate.
Subclass 1: Repair by chipping and/or grinding followed by welding is permitted in accordance with 5.4.2.2.1.
Subclass 2: Repair by welding is only permitted in accordance with 5.4.2.2.2 if agreed by the producer and purchaser and it is specified in the contract.
Subclass 3: Repair by welding is not allowed.
Note: The classification and requirements of surface condition are shown in Table D.1 of Annex D.
When the product standard or contract does not specify the surface condition class and subclass, the class and subclass shall be class A and subclass 1.
5 Requirements
5.1 General requirement for surface condition of steel sheets and plates
Responsibility for the required surface condition, whether the product is delivered descaled or not, rests with the material producer, the producer has to take the necessary precautions. The producer can only take account of discontinuities that are visible to the naked eye. Rolling or heat-treatment scale can conceal surface discontinuities.
If the purchaser needs to be sure that all discontinuities visible to the naked eye have been identified, assessed and where necessary, repaired before delivery, products should be ordered descaled.
If, during the subsequent descaling or working operations by the user, the material is found to be defective because of faulty rolling or processing by the producer, the producer shall be given opportunity to repair the product, provided that this is not in conflict with the appropriate material or product standard.
5.2 Determination of depth and affected area of discontinuities
5.2.1 Determination of depth
Contents of GB/T 14977-2025
Contents
Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 Requirements
6 Rounding off for numerical values
Annex A (Informative) Comparison of clause/subclause numbers between this document and ISO 7788:2021
Annex B (Informative) Technical deviations between this document and ISO 7788:2021 and their justifications
Annex C (Informative) Description of common discontinuities
Annex D (Informative) Classes and subclasses for surface conditions with their respective requirements
