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GB/T 15712-2016 English PDF (GBT15712-2016)

GB/T 15712-2016 English PDF (GBT15712-2016)

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GB/T 15712-2016: Micro-alloyed medium carbon steels

This Standard specifies the terms and definitions, classification, order content, dimension, shape and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of microalloyed medium carbon steel.
GB/T 15712-2016
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.60
H 40
Replacing GB/T 15712-2008
Microalloyed medium carbon steel
(ISO 11692.1994, Ferritic-pearlitic engineering steel for precipitation hardening from hot-working temperatures, MOD)
ISSUED ON. AUGUST 29, 2016
IMPLEMENTED ON. MARCH 1, 2017
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 8
4 classification ... 8
5 Order content ... 8
6 Dimension, shape and allowable deviation ... 9
7 Technical requirements ... 9
8 Test methods ... 15
9 Inspection rules ... 16
10 Packaging, marking and quality certificate ... 17
Annex A (Informative) Comparison of clause and article number in this Standard and those in ISO 11692.1994 ... 18
Annex B (Informative) Technical differences between this standard and ISO 11692.1994 and their causes ... 19
Annex C (informative) Comparing of steel grade in this Standard and steel grade in ISO 11692.1994 ... 21
Foreword
This Standard is drafted according to the rules given in GB/T 1.1-2009. This Standard replaces GB/T 15712-2008 ?€?Microalloyed medium carbon steel?€?. Compared with GB/T 15712-2008, the main changes are as follows.
- ADD the classification of steel according to microstructure;
- ADD six steel grades. F70VS, F38MnSiNS, F48MnV, F37MnSiVS, F41MnSiV,
F25Mn2CrVS and relevant requirements;
- ADJUST the silicon content of parts of steel grades. the silicon content of F35VS, F40VS and F45VS is adjusted from 0.20% ~ 0.40% to 0.15% ~ 0.35%; the silicon content of F30MnVS and F38MnVS is adjusted from ??? 0.80% to 0.30% ~ 0.80%. - ADJUST the carbon content range of F38MnVS, from 0.34% ~ 0.41% to 0.35% ~ 0.42%;
- ADD the requirement of Mo ??? 0.05%;
- CANCEL the residual elements Ni, Cu, Mo, Nb, Ti finished products?€? chemical composition allowable deviation;
- ADD recommended calculation formula for carbon equivalent;
- TIGHTEN the requirements for low magnification;
- TIGHTEN the requirements for decarburization layer;
- ADD the grain size as a protocol requirement;
- ADD the requirement that the surface quality may be in accordance with the requirements of GB/T 28300;
- ADD the requirement that it may provide inspection documents according to GB/T 18253.
This Standard uses the redrafting method to amend and adopt ISO 11692.1994 ?€?Ferritic-pearlitic engineering steel for precipitation hardening from hot-working temperatures?€?.
In order to facilitate comparison, the comparision table of the clause and article number in this Standard and the clause and article number in ISO 11692.1994 is listed in Annex A of this Standard.
Microalloyed medium carbon steel
1 Scope
This Standard specifies the terms and definitions, classification, order content, dimension, shape and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of microalloyed medium carbon steel.
This Standard applies to hot-rolled steel and bright steel (hereinafter referred to as steel) of microalloyed medium carbon steel.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this document. For undated references, the latest edition (including all amendments) applies to this document. GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method (GB/T 223.5-2008, ISO 4829-1.1986, ISO 4829-2.1988, MOD)
GB/T 223.11 Iron steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method (GB/T 223.11-2008, ISO 4937.1986, MOD)
GB/T 223.16 Methods for chemical analysis of iron, steel and alloy - The chromotropic acid photometric method for the determination of titanium content GB/T 223.18 Methods for chemical analysis of iron, steel and alloy - The sodium thiosulfate separation iodimetric method for the determination of copper content GB/T 223.23 Iron steel and alloy - Determination of nickel content - The dimethylglyoxime spectrophotometric method (GB/T 223.23-2008, ISO 4939.1984, MOD)
GB/T 223.26 Iron steel and alloy - Determination of molybdenum content - The thiocyanate spectrophotometric method
GB/T 223.37 Methods for chemical analysis of iron steel and alloy - The 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 223.58 Methods for chemical analysis of iron, steel and alloy - The sodium arsenite-sodium nitrite titrimetric method for the determination of manganese content
GB/T 223.59 Iron steel and alloy - Determination of phosphorus content - Bismuth phosphomolybdate blue spectrophotometric method and antimony
phosphomolybdate blue spectrophotometric method
GB/T 223.68 Methods for chemical analysis of iron, steel and alloy - The potassium iodate titration method after combustion in the pipe furnace for the determination of sulfur content (GB/T 223.68-1997, ISO 671.1982, MOD)
GB/T 223.69 Iron steel and alloy - Determination of carbon contents - Gas- volumetric method after combustion in the pipe furnace
GB/T 223.76 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrometric method for the determination of vanadium content (GB/T 223.76-1994, ISO 9647.1989, MOD)
GB/T 223.78 Methods for chemical analysis of iron, steel and alloy - Curcumin spectrophotometric method for the determination of boron content (GB/T 223.78- 2000, ISO 10153.1997, IDT)
GB/T 224-2008 Determination of depth of decarburization of steel (ISO 3887.2003, MOD)
GB/T 226 Test method for macrostructure and defect of steel by etching
GB/T 228.1 Metallic materials - Tensile testing - Part 1. Method of test at room temperature (GB/T 228.1-2010, ISO 6892-1.2009, MOD)
GB/T 229 Metallic materials - Charpy pendulum impact test method (GB/T 229- 2007, ISO 148-1.2006, MOD)
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1. Test method (GB/T 231.1-2009, ISO 6506-1.2005, MOD)
GB/T 702-2008 Hot-rolled steel bars - Dimensions, shape, weight and tolerances (ISO 1035-1.1980, ISO 1035-2.1980, ISO 1035-4.1982, MOD)
GB/T 1979 Standard diagrams for macrostructure and defect of structural steel GB/T 2101 General requirement of acceptance packaging marking and certification for section steel
GB/T 2975 Steel and steel - Location and preparation of test pieces for mechanical testing (GB/T 2975-1998, eqv ISO 377.1997)
GB/T 3207-2008 Bright steel
GB/T 4162 Forged and rolled steel bars - Method for ultrasonic testing
GB/T 4336 Standard test method for spark discharge atomic emission
spectrometric analysis of carbon and low - Alloy steel (routine method) GB/T 6394 Metal - Methods for estimating the average grain size
GB/T 7736 Ultrasonic inspecting method for macro-structure and imperfection of steel
GB/T 10561-2005 Steel - Determination of content of nonmetallic inclusions - Micrographic method using standards diagrams (ISO 4967.1998, IDT)
GB/T 13298 Inspection methods of microstructure for metals
GB/T 13299 Steel - Determination of microstructure
GB/T 13304.1 Steel classification - Part 1. Classification according to chemical composition (GB/T 13304.1-2008, ISO 4948-1.1982)
GB/T 15574 Steel classification and definitions (GB/T 15574-2016, ISO 6929.2013, MOD)
GB/T 17505 Steel and steel - General technical delivery requirements (GB/T 17505- 2016, ISO 404.2013, MOD)
GB/T 18253 Steel and steel - Types of inspection documents (GB/T 18253-2002, ISO 10474.1991, MOD)
GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition (GB/T 20066-2006, ISO 14284.1996, IDT) GB/T 20123 Steel and iron - Determination of total carbon and sulfur content Infrared absorption method after combustion in an induction furnace (routine method) (GB/T 20123-2006, ISO 15350.2000, IDT)
GB/T 20124 Steel and iron - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of iner...

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