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GB/T 34484 consists of two parts under the general title Heat-treatable steels:
——Part 1: Non-alloy steels;
——Part 2: Alloy steels for quenching and tempering.
This part is Part 1 of GB/T 34484.
This part is developed in accordance with the rules given in GB/T 1.1-2009.
This part is redrafted and modified in relation to ISO 683-1:2016 Heat-treatable steels, alloy steels and free-cutting steels—Part 1: Non-alloy steels for quenching and tempering.
This part is changed from ISO 683-1:2016 in structure; the cross-reference table for clause and article numbers of this part and ISO 683-1:2016 is given in Annex A.
Technical changes have been made in this part with respect to ISO 683-1:2016, and are marked with a vertical singlet (｜) at the margin of relevant clauses; see Annex B for the list of technical differences and their causes.
For the convenience of use, the following editorial changes are made in this part:
——The standard is renamed as Heat-treatable steels—Part 1: Non-alloy steels;
——Bibliography in ISO 683-1:2016 is deleted.
This part was proposed by China Iron and Steel Association.
This standard is under the jurisdiction of the National Technical Committee on Iron and Steel of Standardization Administration of China (SAC/TC 183).
Heat-treatable steels—
Part 1: Non-alloy steels
1 Scope
This part of GB/T 34484 specifies the classification and designation, order contents, dimensions, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of heat-treatable non-alloy steels.
This part is applicable to rolled rods and bars (hereinafter referred to as steels) with nominal diameter or thickness not greater than 310 mm.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223.11 Methods for chemical analysis of iron, steel and alloy—The ammonium persulfate oxidation volumetric method for the determination of chromium content (GB/T 223.11-2008, ISO 4937:1986, MOD)
GB/T 223.23 Methods for chemical analysis of iron, steel and alloy—The dimethylglyoxime spectrophotometric method for the determination of nickel content
GB/T 223.26 Iron steel and alloy—Determination of molybdenum content—The thiocyanate spectrophotometric method
GB/T 223.53 Methods for chemical analysis of iron, steel and alloy—The flame atomic absorption spectrophotometric method for the determination of copper content
GB/T 223.60 Methods for chemical analysis of iron, steel and alloy—The perchloric acid dehydration gravimetric method for the determination of silicon content
GB/T 223.62 Methods for chemical analysis of iron, steel and alloy—The butyl acetate extraction photometric method for the determination of phosphorus content
GB/T 223.64 Methods for chemical analysis of iron, steel and alloy—The flame atomic absorption spectrometric method for the determination of manganese content
GB/T 223.69 Methods for chemical analysis of iron, steel and alloy—The gas- volumetric method after combustion in the pipe furnace for the determination of carbon content
GB/T 223.72 Methods for chemical analysis of iron, steel and alloy—The alumina chromatographic separation-barium sulfate gravimetric method for the determination of sulphur content
GB/T 226 Etch test for macrostructure and defect of steels
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 702 Hot-rolled steel bars—Dimensions, shape, weight and tolerances
GB/T 1979 Standard diagrams for macrostructure and defect of structural steels
GB/T 2101 General requirement of acceptance, packaging, marking and certification for section steel
GB/T 4162 Forged and rolled steel bars—Method for ultrasonic testing
GB/T 4336 Carbon and low-alloy steel—Determination of multi-element contents—Spark discharge atomic emission spectrometric method (routine method)
GB/T 6394 Metal-methods for estimating the average grain size
GB/T 10561-2005 Steel—Determination of content of nonmetallic inclusions—Micrographic method using standards diagrams (GB/T 10561-2005, ISO 4967:1998, DT)
GB/T 17505 Steel and steel products—General technical delivery requirements (GB/T 17505-2016, ISO 404:2013, IDT)
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)
3 Classification and designation
The classification and designation of steels in accordance with heat treatment conditions at delivery are as follows:
a) Normalizing, N;
b) Quenching and tempering, QT.
4 Order contents
Contracts or orders made based on this part shall cover the following items:
a) Number of this part;
b) Product name;
c) Grade;
d) Smelting method (see 6.2);
e) Delivery condition (see 6.3);
f) Weight (or quantity);
g) Dimensions and shape (see Clause 5);
h) Processing method;
i) Special requirements.
5 Dimensions, shape and weight
5.1 The dimensions, shape and permissible tolerances of steels shall meet the relevant requirements of GB/T 702, and the specific requirements shall be indicated in the contract.
5.2 Steels are delivered at actual weight. But it may be delivered at theoretical weight through negotiation between the supplier and the purchaser.
6 Technical requirements
6.1 Grades and chemical composition
6.1.1 The steel grades and chemical composition (smelting analysis) shall be as specified in Table 1.
Foreword i
1 Scope
2 Normative references
3 Classification and designation
4 Order contents
5 Dimensions, shape and weight
6 Technical requirements
6.1 Grades and chemical composition
6.2 Smelting method
6.3 Delivery condition
6.4 Mechanical properties
6.5 Macrostructure
6.6 Grain size
6.7 Surface quality
6.8 Special requirements
7 Test methods
8 Inspection rules
8.1 Inspection and acceptance
8.2 Batching rules
8.3 Sampling size and position
8.4 Re-inspection and judgment rules
9 Packaging, marking and quality certificate
Annex A (Informative) Structure changes of this part by comparison with ISO 683-1:
Annex B (Informative) Technical differences between this part and ISO 683-1:2016 and their causes
Annex C (Informative) Cross-reference of domestic and foreign grades
Annex D (Normative) Sampling position for mechanical property test
