JB/T 6401-2017Steels for large roll forgings - Technical requirements (English PDF)
大型轧辊锻件用钢 技术条件
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Issued by
MIIT
Level / Type
Industry · Recommended
Issue date
January 9, 2017
Implementation date
July 1, 2017
Scope
JB/T 6401-2017 is the English-translated version of 大型轧辊锻件用钢 技术条件.
Steel used for heavy roll forgings is the subject of JB/T 6401-2017. The standard sets the order requirements, the manufacturing process, the technical requirements, the inspection rules and test methods, the quality certificate and the marking and packaging for heavy roll forgings such as cold-rolled and hot-rolled work rolls and backup rolls.
It applies to the order, manufacture and inspection of these forgings. The standard replaces JB/T 6401-1992; it was issued on 9 January 2017 and implemented on 1 July 2017.
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Document preview — JB/T 6401-2017
National Standard of the People's Republic of China
- Replacing
- JB/T 6401-1992
Issued by: Ministry of Industry and Information Technology of the People's Republic of China
Contents
- Foreword3
- 1 Scope5
- 2 Normative references5
- 3 Order requirements5
- 4 Manufacturing process6
- 4.1 Smelting6
- 4.2 Forging6
- 4.3 Heat treatment6
- 5 Technical requirements6
- 5.1 Chemical composition6
- 5.2 Mechanical properties8
- 5.3 Hardness9
- 6 Inspection rules and test methods10
- 6.1 Chemical composition analysis10
- 6.2 Tests of mechanical properties10
- 6.3 Hardness test11
- 7 Quality certificate12
- 8 Marking and packaging12
1 Scope
This Standard specifies the order requirements, manufacturing process, technical requirements, inspection rules and test methods, quality certificate, marking and packaging for heavy roll forgings, such as cold-rolled, hot-rolled work rolls and backup rolls.
This Standard applies to the order, manufacture, and inspection of heavy roll forgings (hereinafter referred to as forgings).
2 Normative references
The following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document.
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 229 Metallic materials - Charpy pendulum impact test method
GB/T 13313 Methods of Shore and Leeb hardness testing for rolls
3 Order requirements
3.1 The purchaser shall specify in the order contract or technical agreement the purpose, name, quantity, material designation, and delivery status of forgings; various technical requirements and inspection items defined by both the supplier and the purchaser; and inspection items other than those required by this Standard.
3.2 The purchaser shall provide the order drawing and the finishing drawing indicating the dimension and technical requirements of the forgings.
3.3 When the purchaser has supplementary requirements, the supplementary requirements shall be negotiated by both the supplier and the purchaser.
4 Manufacturing process
4.1 Smelting
Steel used for forgings shall be refined by ladle. Vacuum degassing shall be used as much as possible, to reduce the content of harmful gases in steel. With the consent of the purchaser, other methods such as out-of-furnace refining or electroslag remelting that can meet the requirements of this Standard may also be used. The smelting method of hot-rolled work rolls can also be negotiated by both the supplier and the purchaser.
4.2 Forging
4.2.1 Each ingot riser and both ends of the ingot tail shall have enough cut, to ensure that the forgings are free from harmful defects, such as shrinkage cavities and severe segregation.
4.2.2 Forgings shall be forged on a forging press with sufficient capacity, to ensure that the entire section of the forging is fully forged; and the entire forging can be uniformly structured, with a forging ratio of >=3.
4.3 Heat treatment
Carry out heat treatment according to the delivery status of the forgings specified in the order contract.
5 Technical requirements
5.1 Chemical composition
5.1.1 The analysis results of hot-rolled work rolls shall meet the requirements of Table 1.
5.1.2 The analysis results of cold-rolled work rolls shall meet the requirements of Table 2.
5.1.3 The analysis results of backup rolls shall meet the requirements of Table 3. When multiple furnaces are poured together, the weight analysis results shall prevail. […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Similar standards
Editions of JB/T 6401
| Edition | Title | Revision | Status |
|---|---|---|---|
| JB/T 6401-2017 | Steels for large roll forgings - Technical requirements | current edition | Current |
| JB/T 6401-1992 | Steels for large roll forgings - Technical requirements | previous edition | Superseded |
This page sells the current edition, JB/T 6401-2017. Earlier editions are listed for reference only.
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Related Standards
GB/T 13313-2008 — Methods of shore and leeb hardness testing for rolls
GB/T 223.11-2008 — Iron, steel and alloy -- Determination of chromium content -- Visual titration or potentiometric titration method
GB/T 223.11-2025 — Iron, steel and alloy - Determination of chromium content - Titrimetric method and spectrophotometric method
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