GB 4234.12-2024 English PDF

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GB 4234.12-2024: Implants for surgery - Metallic materials - Part 12: Wrought cobalt-chromium-molybdenum alloy
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Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB 4234.12-2024	199	Add to Cart	3 days	Implants for surgery - Metallic materials - Part 12: Wrought cobalt-chromium-molybdenum alloy	Valid

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Basic data

Standard ID: GB 4234.12-2024 (GB4234.12-2024)
Description (Translated English): Implants for surgery - Metallic materials - Part 12: Wrought cobalt-chromium-molybdenum alloy
Sector / Industry: National Standard
Classification of Chinese Standard: C35
Classification of International Standard: 11.040.40
Word Count Estimation: 10,147
Date of Issue: 2024-10-28
Date of Implementation: 2026-11-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB 4234.12-2024: Implants for surgery - Metallic materials - Part 12: Wrought cobalt-chromium-molybdenum alloy

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 11.040.40 CCSC35 National Standard of the People's Republic of China Surgical implant metal materials Part 12.Wrought cobalt-chromium-molybdenum alloys (ISO 5832-12.2019,MOD) Released on 2024-10-28 2026-11-01 implementation State Administration for Market Regulation The National Standardization Administration issued

Table of Contents

Preface III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Chemical composition 1 5 Microstructure 2 6 Mechanical properties 2 7 Test method 2

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. This document is part 12 of GB 4234 "Metallic materials for surgical implants". GB 4234 has been published in the following parts. --- Part 1.Forged stainless steel; --- Part 2.Pure titanium; --- Part 3.Wrought titanium-6 aluminium-4 vanadium alloy; --- Part 4.Cast cobalt-chromium-molybdenum alloys; --- Part 7.Forgeable and cold worked cobalt-chromium-nickel-molybdenum-iron alloys; --- Part 9.Forged high nitrogen stainless steel; --- Part 12.Wrought cobalt-chromium-molybdenum alloys. This document is modified to adopt ISO 5832-12.2019 "Metallic materials for surgical implants - Part 12.Wrought cobalt-chromium-molybdenum alloys". The technical differences between this document and ISO 5832-12.2019 and their reasons are as follows. --- ISO 6892-1 (see Chapter 7) has been replaced by the normative reference GB/T 228.1 to adapt to my country's technical conditions and improve the reliability of the product. Operability; --- ISO 643 (see Chapter 7) has been replaced by the normative reference GB/T 6394 to adapt to my country's technical conditions and improve operability. Acting nature. The following editorial changes were made to this document. --- Move "Note 1" in Chapter 1 of ISO 5832-12.2019 to "Note" in Chapter 6. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document is proposed and coordinated by the State Food and Drug Administration.

Introduction

Implants are high-risk medical devices, and their material properties are essential parameters for preclinical evaluation to ensure the safety of implants after implantation in the human body. GB 4234 "Metallic Materials for Surgical Implants" series of standards aims to regulate the properties of metallic materials for surgical implants. The performance requirements and test methods are intended to consist of the following parts. --- Part 1.Wrought stainless steel. The purpose is to standardize the performance requirements and test methods of wrought stainless steel materials for surgical implants. --- Part 2.Pure titanium. The purpose is to standardize the performance requirements and test methods of pure titanium materials for surgical implants. --- Part 3.Wrought titanium-6 aluminum-4 vanadium alloy. The purpose is to standardize the properties of wrought titanium-6 aluminum-4 vanadium alloy materials for surgical implants. Requirements and test methods. --- Part 4.Cast cobalt-chromium-molybdenum alloy. The purpose is to specify the performance requirements of cast cobalt-chromium-molybdenum alloy materials for surgical implants and test methods. --- Part 5.Wrought cobalt-chromium-tungsten-nickel alloy. The purpose is to standardize the properties of wrought cobalt-chromium-tungsten-nickel alloy materials for surgical implants. Requirements and test methods. --- Part 6.Wrought cobalt-nickel-chromium-molybdenum alloy. The purpose is to standardize the properties of wrought cobalt-nickel-chromium-molybdenum alloy materials for surgical implants. Requirements and test methods. --- Part 7.Forgeable and cold worked cobalt-chromium-nickel-molybdenum-iron alloys. The purpose is to specify forgeable and cold worked cobalt-chromium-nickel-molybdenum-iron alloys for surgical implants. Performance requirements and test methods for cobalt-chromium-nickel-molybdenum-iron alloy materials. --- Part 9.Forged high nitrogen stainless steel. The purpose is to standardize the performance requirements and Test method. --- Part 11.Wrought titanium-6 aluminium-7 niobium alloy. The purpose is to specify the wrought titanium-6 aluminium-7 niobium alloy material for surgical implants. Performance requirements and test methods. --- Part 12.Wrought cobalt-chromium-molybdenum alloys. The purpose is to specify the performance requirements of wrought cobalt-chromium-molybdenum alloy materials for surgical implants. Summation test method. There is no known surgical implant material that has been proven to be completely non-toxic to the human body. However, the materials covered in this document Long-term clinical applications have shown that if applied appropriately, the expected level of biological response is acceptable. Surgical implant metal materials Part 12.Wrought cobalt-chromium-molybdenum alloys

1 Scope

This document specifies the requirements for two wrought Cobalt-28Chromium-6Molybdenum alloys for use in surgical implants. This document applies to press-worked rods and wires. Note. High carbon alloys produce a distinct carbide distribution structure that can be adjusted during the production of the bar or during the subsequent heat treatment of the finished product. The distribution of substances is outside the scope of this document.

2 Normative references

The contents of the following documents constitute 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 228.1 Tensile tests on metallic materials - Part 1.Test methods at room temperature (GB/T 228.1-2021, ISO 6892-1. 2019,MOD) GB/T 6394 Determination of average grain size of metals

3 Terms and definitions

There are no terms or definitions that require definition in this document. The terminology databases used for standardization maintained by ISO and IEC are located at.

4 Chemical composition

Conduct smelting analysis on representative alloy samples according to the method specified in Chapter 7, and their chemical composition shall conform to the requirements of Table 1. Table 1 Chemical composition element Chemical composition %(mass fraction) Alloy 1 (low carbon) Alloy 2 (high carbon) Chromium (Cr) 26.0~30.0 26.0~30.0 Molybdenum (Mo) 5.0~7.0 5.0~7.0 Iron (Fe) ≤0.75 ≤0.75 Manganese (Mn) ≤1.0 ≤1.0 ......

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