Standard No.:	GB/T 15712-2008
English Name:	Microalloyed medium carbon steels
Chinese Name:	非调质机械结构钢
Chinese Classification:	H40    Steel and iron products in general
Professional Classification:	GB    National Standard
ICS Classification:	77.080.20 77.080.20    Steels 77.080.20
Issued by:	AQSIQ; SAC
Issued on:	2008-05-13
Implemented on:	2008-11-1
Status:	superseded
Superseded by:	GB/T 15712-2016 Microalloyed medium crabon steels
Superseded on:	2017-7-1
Superseding:	GB/T 15712-1995 Ferritic-pearlitic engineering steels for precipitation hardening from hot-working temperature
Language:	English
File Format:	PDF
Word Count:	5000 words
Price(USD):	120.0
Delivery:	via email in 1 business day

1 Scope This standard specifies the definition, classification, order contents, dimension, appearance and permissible deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of microalloyed medium carbon steels. This standard is applicable to hot-rolled steel and bright steel which are belong to microalloyed medium carbon steels. 2 Normative References The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. For dated references, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties who enter into agreement according to this standard are encouraged to study whether the latest editions of these documents apply. For undated references, the latest edition applies to this standard. GB/T 223.3 Methods for Chemical Analysis of Iron, Steel and Alloy - Diantipyrylmethane Phosphomolybdate Gravimetric Method for the Determination of Phosphorus Content GB/T 223.4 Methods for Chemical Analysis of Iron, Steel And Alloy - Volumetric Method for Determination of Manganese Content by Ammonium Nitrate Oxidation GB/T 223.5 Methods for Chemical Analysis of Iron, Steel and Alloy - Reduced Molybdosilicate Spectrophotometric Method for the Determination of Acid-soluble Silicon Content GB/T 223.11 Methods for Chemical Analysis of Iron, Steel and Alloy - Ammonium Persulfate Oxidation Volumetric Method for the Determination of Chromium Content GB/T 223.12 Methods for Chemical Analysis of Iron, Steel and Alloy - Sodium Carbonate Separation-diphenyl Carbazide Photometric Method for the Determination of Chromium Content GB/T 223.13 Methods for Chemical Analysis of Iron, Steel and Alloy - Ammonium Ferrous Sulfate Titration Method for the Determination of Vanadium Content GB/T 223.14 Methods for Chemical Analysis of Iron, Steel and Alloy - N-benzoy-N-phenylhydroxylamine Extraction Photometric Method for the Determination of Vanadium Content GB/T 223.16 Methods for Chemical Analysis of Iron, Steel and Alloy - Chromotropic Acid Photometric Method for the Determination of Titanium Content GB/T 223.17 Methods for Chemical Analysis of Iron Steel and Alloy - Diantipyrylmethane Photometric Method for the Determination of Titanium Content GB/T 223.18 Methods for Chemical Analysis of Iron, Steel and Alloy - Sodium Thiosulfate Separation Iodimetric Method for the Determination of Copper Content GB/T 223.19 Methods for Chemical Analysis of Iron Steel and Alloy - Neocuproine-chloroform Extraction Photometric Method for the Determination of Copper Content GB/T 223.23 Methods for Chemical Analysis of Iron, Steel and Alloy - Dimethylglyoxime Spectrophotometric Method for the Determination of Nickel Content GB/T 223.24 Methods for Chemical Analysis of Iron, Steel and Alloy - Extraction Separation - Dimethylglyoxime Spectrophotometric Method for the Determination of Nickel Content GB/T 223.37 Methods for Chemical Analysis of Iron Steel and Alloy - Indophenal Blue Photometric Methods for the Determination of Nitrogen Content after Distillation Separation GB/T 223.40 Iron Steel and Alloy - Determination of Niobium Content by the Sulphochlorophenol S Spectrophotometric Method GB/T 223.53 Methods for Chemical Analysis of Iron, Steel and Alloy - Flame Atomic Absorption Spectrophotometric Method for the Determination of Copper Content GB/T 223.54 Methods for Chemical Analysis of Iron, Steel and Alloy - Flame Atomic Absorption Spectrophotometric Method for the Determination of Nickel Content GB/T 223.58 Methods for Chemical Analysis of Iron, Steel and Alloy - Sodium Arsenite-sodium Nitrite Titrimetric Method for the Determination of Manganese Content GB/T 223.59 Methods for Chemical Analysis of Iron, Steel and Alloy - Reduced Molybdoantimonyl Phosphoric Acid Photometric Method for the Determination of Phosphorus Content GB/T 223.60 Methods for Chemical Analysis of Iron, Steel and Alloy - Perchloric Acid Dehydration Gravimetric Method for the Determination of Silicon Content GB/T 223.61 Methods for Chemical Analysis of Iron, Steel and Alloy - Ammonium Phosphomolybdate Volumetric Method for the Determination of Phosphorus Content GB/T 223.62 Methods for Chemical Analysis of Iron, Steel and Alloy - Butyl Acetate Extraction Photometric Method for the Determination of Phosphorus Content GB/T 223.63 Methods for Chemical Analysis of Iron, Steel and Alloy – Sodium (Potassium) Periodate Photometric Method for the Determination of Manganese Content (GB/T 223.63-1998, neq ISO R 629) GB/T 223.64 Methods for Chemical Analysis of Iron, Steel and Alloy - Flame Atomic Absorption Spectrometric Method for the Determination of Manganese Content

Foreword i 1 Scope 2 Normative References 3 Terminologies and Definitions 4 Classifications 5 Order Contents 6 Shape, Dimension and Tolerance 7 Technical Requirements 8 Test Method 9 Inspection Rules 10 Packaging, Marking and Quality Certificate Appendix A (Informative) Comparison of Designations in This Standard and Those in Edition 1995 and ISO Appendix B (Informative) Technical Differences Between This Standard and ISO 11692:1994 and the Reasons