GB/T 1221-2007 PDF English
US$145.00 · In stock · Download in 9 secondsGB/T 1221-2007: Heat-Resistant Steel Bars Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 1221: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 1221-2007 | English | 145 |
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Heat-Resistant Steel Bars
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| GB/T 1221-1992 | English | 799 |
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Heat-resisting steel bars
| Obsolete |
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GB/T 1221-2007: Heat-Resistant Steel Bars---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT1221-2007
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.20
H 40
Replacing GB/T 1221-1992
Heat-Resistant Steel Bars
Issued on. MAY 14, 2007
Implemented on. DECEMBER 01, 2007
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative References... 5
3 Terms and Definitions... 9
4 Order Content... 9
5 Classification... 10
6 Size, Shape, Weight and Allowable Deviation... 10
7 Technical Requirements... 13
8 Test Method... 28
9 Inspection Rules... 28
10 Packing, Marking, and Certificate of Quality... 30
Annex A (Informative) Typical Heat Treatment System of Heat-Resistant Steel
Rods or Samples... 31
Annex B (Informative) Characteristics and Use of Heat-Resistant Steel... 35
1 Scope
This Standard specifies the size, shape, technical requirements, test methods,
acceptance rules, packing marks, certificate of quality and other contents of heat-
resistant steel rods (the general name of round steel, square steel, flat steel and
hexagonal steel, hereinafter referred to as steel rods).
This Standard is applicable to hot-rolled, forged steel rods with size (diameter, side
length, thickness or opposite side distance, hereinafter referred to as size) of not more
than 250mm; or cold-processing rods with size of not more than 120mm. After
negotiation between the supplier and the purchaser, the hot-rolled, forged steel rods
with size more than 250mm, and the cold-processing steel rods with size of more than
120 mm can also be supplied.
2 Normative References
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrigendum) or revisions do not apply to this Standard, however, parties
who reach an agreement based on this Standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
GB/T 222 Allowable Deviation for Chemical Components of Finished Steel
Products
GB/T 223.3 Methods for Chemical Analysis of Iron, Steel and Alloy -
Diantipyrylmethane Phosphomolybdate Acid Gravimetric Method for the
Determination of Phosphorus Content
GB/T 223.4 Methods for Chemical Analysis of Iron, Steel and Alloy - Ammonium
Nitrate Oxidation Volumetric Method for the Determination of Manganese Content
GB/T 223.5 Methods for Chemical Analysis of Iron, Steel and Alloy - Reduction
Type Molybdosilicate Spectrophotometry for the Determination of Acid-Soluble
Silicon Content
GB/T 223.8 Methods for Chemical Analysis of Iron, Steel and Alloy - Sodium
Fluoride Separation - EDTA Titrimetric Method for the Determination of Aluminum
Content
3 Terms and Definitions
The terms and definitions established in GB/T 20878 and GB/T 15574 standard are
applicable to this Standard.
4 Order Content
According to the order contract of this Standard or order form, it shall include the
following contents.
5 Classification
5.1 Steel rods can be classified into four types. austenitic type, ferritic type, martensitic
type and precipitation hardening type according to their structural characteristics.
5.2 According to the different processing methods in use, the steel rods can be divided
into the following two categories.
6 Size, Shape, Weight and Allowable Deviation
6.1 Size, shape and allowable deviation of hot-rolled round steel and square steel
6.2 Size, shape and allowable deviation of hot-rolled flat steel
The size, shape and allowable deviation of hot-rolled flat steel shall be in accordance
with the provisions of GB/T 704-1988, and the specific requirements shall be specified
in the contract.
6.3 Size, shape and allowable deviation of hot-rolled hexagonal steel
6.5 Size, shape and allowable deviation of forged flat steel
The size, shape and allowable deviation of forged flat steel shall be in accordance with
the provisions of GB/T 16761-1997, and the specific requirements shall be specified in
the contract.
6.6 Size, shape and allowable deviation of cold processing steel rods
6.6.1 Size and allowable deviation
6.7 Weight
Steel rods shall be delivered according to actual weight.
7 Technical Requirements
7.1 Designation and chemical component
7.2 Smelting method
Unless otherwise specified in the contract, primary steelmaking (molten steel) plus
external refining and other processes are used generally.
7.3 Delivery state
The steel rods can be delivered in heat treatment or non-heat treatment state. When
ordering, the delivery state can be selected with reference to Subclauses 7.3.1~ 7.3.5,
and it shall be specified in the contract.
7.3.1 Solution treatment or annealing treatment is conducted to austenitic steel rods
for cutting processing. It is allowed not to conduct treatment upon negotiation between
the supplier and the purchaser.
7.3.2 Annealing treatment is conducted for ferritic steel rods, and it is allowed not to
conduct treatment upon negotiation between the supplier and the purchaser.
7.4 Mechanical property
7.4.1 The heat treatment system of all kinds of steel rods or samples is shown in Tables
A.1 ~ A.4 in Annex A. The size of the sample blank for heat treatment is generally 25
mm. When the size of steel rods is less than 25 mm, heat treatment is conducted with
the steel rods in original size.
7.4.2 The steel rods after heat treatment (except martensitic steel annealing), the
samples are no longer conducted with heat treatment; and their mechanical property
shall comply with the provisions of Tables 8~11, respectively.
7.4.3 The mechanical property of steel rods without heat treatment and sample blank
after heat treatment shall comply with the provisions of Tables 8 ~11.
7.5 Macrostructure
7.5.1 No visible shrinkage cavity, bubble, crack, inclusion, skin patch and white spot
are allowed on the acid pickling macrostructure test piece of cross section of steel rods.
The steel rods for cutting processing is allowed to have a depth of not more than half
of the nominal size tolerance.
7.5.2 The qualification grade of acid pickling macrostructure shall comply with the
provisions of Table 12.When the purchaser asks for Group 1, it shall be specified in
the contract. For the steel rods whose size are more than 200 mm, the qualification
grade of its macrostructure is determined by the supplier and the purchaser through
negotiation.
7.6 Hot top forging
7.6.1 Hot top forging steel (specified in the contract) shall be conducted with the hot
top forging test. The height of the sample after hot top forging is 1/3 of the height of
original sample. There shall be no gaps or cracks on the samples after the top forging.
7.6.2 The steel rods whose size are more than 80 mm cannot be tested if the supplier
can guarantee the qualification of the top forging test.
7.7 Surface quality
7.8 Special requirements
According to the requirements of the purchaser, and after the agreement between the
supplier and the purchaser, we can supply the steel rods meeting the following special
requirements.
8 Test Method
The inspection items and test methods for each batch of steel rods shall comply with
the provisions of Table 15.
9 Inspection Rules
9.1 Inspection and acceptance
The inspection and acceptance of steel rods shall be conducted by Technical Quality
Supervision Department of the supplier.
9.2 Group batching rules
The steel rods shall be inspected and accepted in batches. Each batch consists of the
steel rods with the same designation, the same furnace number, the same processing
method, the same size and the same delivery state (the same heat treatment furnace
batch).
9.3 Sampling part and number of samples
Sampling part and number of samples of each batch of steel rods shall comply with
the provisions of Table 15.
9.4 Re-inspection and determination rules
9.4.1 The re-inspection and determination rules shall be in accordance with the
relevant provisions of GB/T 17505.
9.4.2 If the supplier can ensure that the steel rods are qualified, the inspection results
of the mechanical property of steel rods or billets of the same furnace number,
macrostructure and non-metallic inclusions are allowed to replace materials with the
returned ones and the large with the small.
10 Packing, Marking, and Certificate of Quality
The packing, marking and certificate of quality of the steel rods shall comply with the
provisions of GB/T 2101.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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