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GB/T 46218-2025Backup roll (English PDF)

支承辊

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 29, 2025

Implementation date

March 1, 2026

Scope

GB/T 46218-2025 is the English-translated version of 支承辊.

GB/T 46218-2025 is the Chinese national standard for rolling-mill backup rolls. It sets the technical requirements, the test methods, the inspection rules, the quality certificate and the marking, packaging, transportation and storage requirements, with terminology from GB/T 15546-2022.

A roll is made to the order drawing agreed by supplier and purchaser, by integral forging or casting, by a combination of the two, or by a metallurgical composite route such as electroslag or surfacing; the chemical composition follows the table in the standard, and the mandrel of a composite roll may be carbon or low-alloy structural steel.

Hardness is checked by the Brinell, Shore and Leeb methods, and forgings ultrasonically under GB/T 6402. It applies to backup rolls and roll sleeves for ferrous and non-ferrous rolling mills. It was issued on 29 August 2025 and has applied since 1 March 2026.

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Document preview — GB/T 46218-2025

National Standard of the People's Republic of China

ICS: 77.180
Classification: H 94

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword
1 Scope
2 Normative documents
3 Terms and Definitions
4 Technical Requirements

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

1 Scope

This document specifies the technical requirements, test methods, inspection rules, quality certificates, markings, packaging, transportation and storage of support rollers.

This document is applicable to support rolls (including roll sleeves) used in rolling mills for ferrous and non-ferrous metals. Support rolls for other purposes shall be implemented for reference.

2 Normative documents

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

GB/T 223 (all parts) Chemical analysis methods for steel and alloys

GB/T 231.1 Metallic materials Brinell hardness test Part 1: Test method

GB/T 1184 Tolerances on shape and position without tolerance value

GB/T 1503 Cast steel rolls

GB/T 1804 General tolerances Tolerances for linear and angular dimensions without tolerance indications

GB/T 6402 Ultrasonic testing method for steel forgings

GB/T 13313 Test method for Shore and Leeb hardness of rolls

GB/T 15546-2022 Terminology for Metallurgical Rolls

GB/T 17394.1 Metallic materials Leeb hardness test Part 1: Test method

3 Terms and Definitions

The terms and definitions defined in GB/T 15546-2022 apply to this document.

4 Technical Requirements

4.1 General requirements

4.1.1 The backup rollers shall be manufactured in accordance with this document based on the purpose of use and the order drawings confirmed by both the supplier and the buyer.

4.1.2 It can be manufactured by integral forging, integral casting, or a combination of methods, or it can be manufactured by metallurgical composite methods such as casting, forging, electroslag, and surfacing.

When placing an order, the supplier and the buyer should agree on this. If the buyer has other requirements, other manufacturing methods agreed upon by the supplier and the buyer may also be used.

4.1.3 Technical requirements other than those in this document shall be agreed upon by the supplier and the buyer.

4.2 Chemical composition

4.2.1 The chemical composition shall comply with the requirements of Table 1. If the purchaser has other requirements, other brands and chemical compositions agreed upon by the purchaser and the supplier may be used. Element.

4.2.2 When combined or metallurgical composite methods are used for manufacturing, the core shaft (core) may be made of high-quality carbon steel, low-alloy structural steel or other materials that meet the performance requirements. Request for iron materials.

4.2.3 The chemical composition of the mandrel (core) shall be designed by the manufacturer based on performance requirements.

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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

Normative references

GB/T 223

Cited by

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