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GB/T 4238-2015 PDF in English


GB/T 4238-2015 (GB/T4238-2015, GBT 4238-2015, GBT4238-2015)
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GB/T 4238-2015: PDF in English (GBT 4238-2015)

GB/T 4238-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Replacing GB/T 4238-2007
Heat-resisting steel plate, sheet and strip
ISSUED ON. SEPTEMBER 11, 2015
IMPLEMENTED ON. JUNE 1, 2016
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 Order content ... 8
4 Dimensions, shape, weight and allowable deviation ... 8
5 Technical requirements ... 8
6 Test methods ... 19
7 Inspection rules ... 20
8 Packing, marking and quality certificate ... 21
Annex A (informative) Comparing table of heat-resisting steel grades in different
countries ... 22
Annex B (informative) Characteristics and uses of heat-resisting steels ... 25
Annex C (informative) Heat treatment system of heat-resisting steels ... 29
Foreword
This Standard is drafted according to the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 4238-2007 “Heat-resisting steel plate, sheet and strip”.
Compared with GB/T 4238-2007, the main technical changes are as follows.
- ADD six steel grades and related technical requirements;
- ADJUST the chemical composition of the 5 grades and the mechanical properties
of 6 grades;
- CHANGE the elongation after fracture of the steel plate, sheet and strip with the
thickness not more than 3 mm FROM A TO A50 mm;
- CANCLE the requirement of “when the 16Cr25Ni20Si2 steel plate’s thickness is
greater than 25 mm, the mechanical properties are for reference only”;
- REVISE the reinspection and determination rules;
- ADD the mechanical properties and rules of rounding off for chemical composition
test results;
- ADD the determination rules of the grain size of some steel grades;
- ADJUST the solid solution treatment temperature of 4 grades in Annex C;
- COMPLEMENT the characteristics and uses in Annex B;
- ADD the informative Annex C, comparing table of heat-resisting steel grades in
different countries.
This Standard is proposed by China Iron and Steel Association.
The Standard is under the jurisdiction of National Technical Committee on Steel of
Standardization Administration of China (SAC/TC 183).
Main drafting organizations of this Standard. Shanxi Taigang Stainless Steel Co., Ltd.,
Baosteel Stainless Steel Co., Ltd., Metallurgical Industry Information Standards
Institute.
Main drafters of this Standard. Li Guoping, Ren Yongxiu, Xu Zhongjie, Dong Li, Wang
Chuandong, Zhang Weixu, Zhang Jianjun.
The previous version of the standards replaced by this Standard are as follows.
- GB/T 4238-1984, GB/T 4238-1992, GB/T 4238-2007;
Heat-resisting steel plate, sheet and strip
1 Scope
This Standard specifies the order content, dimension, shape, weight and allowable
deviation, technical requirements, test methods, inspection rules, packaging, marking
and quality certificates of heat-resisting steel plates, sheets and strips.
This Standard applies to hot-rolled and cold-rolled heat-resisting steel plates, sheets
and strips.
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 222 Permissible tolerances for chemical composition of steel products
GB/T 223.3 Methods for chemical analysis of iron, steel and alloy - The
diantipyrylmethane phosphomolybdate gravimetric method for the determination of
phosphorus content
GB/T 223.4 Alloyed steel - Determination of manganese content - Potentiometric or
visual titration method
GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon
content - Reduced molybdosilicate spectrophotometric method
GB/T 223.8 Methods for chemical analysis of iron, steel and alloy - The sodium
fluoride separation-EDTA titration method for the determination of aluminium
content
GB/T 223.9 Iron steel and alloy - Determination of aluminium content - Chrom azurol
S photometric method
GB/T 223.11 Iron steel and alloy - Determination of chromium content - Visual
titration or potentiometric titration method
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 223.19 Methods for chemical analysis of iron steel and alloy - The
neocuproine-chloroform extraction photometric 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 223.25 Methods for chemical analysis of iron, steel and alloy - The
dimethylglyoxime gravimetric 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 223.28 Methods for chemical analysis of iron steel and alloy - The α-
denzoinoxime gravimetric method for the determination of molybdenum content
GB/T 223.33 Methods for chemical analysis of iron, steel and alloy - The
chlorophosphonazo mA photometric method for the determination of cerium content
after extraction separation
GB/T 223.36 Methods for chemical analysis of iron, steel and alloy - The neutral
titration method 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 223.43 Methods for chemical analysis of iron, steel and alloy - Determination
of tungsten content
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 223.58 Methods for chemical analysis of iron, steel and alloy - The sodium
arsenite-sodium nitrite titrimetric method for the determination of manganese
content
GB/T 223.60 Methods for chemical analysis of iron, steel and alloy - The perchloric
acid dehydration gravimetric method for the determination of silicon content
GB/T 223.61 Methods for chemical analysis of iron, steel and alloy - The ammonium
phosphomolybdate volumetric method for the determination of phosphorus content
GB/T 20878 Stainless and heat-resisting steels - Designation and chemical
composition
3 Order content
The contract or order according to this Standard shall include the following contents.
a) standard number;
b) product name;
c) steel grade or unified digital code;
d) dimension and precision;
e) weight (quantity) of the delivery;
f) surface processing type;
g) delivery state;
h) items or indicators in the standard that shall be agreed upon by both supply and
demand parties and indicated in the contract, if not indicated, shall be selected
by the supply party;
i) other special requirements put forward by the demand party shall be agreed upon
by both supply and demand parties and indicated in the contract.
4 Dimensions, shape, weight and allowable deviation
The dimension, shape, weight and allowable deviation of cold-rolled steel plate, sheet
and strip shall comply with the specifications of GB/T 3280. The dimension, shape,
weight and allowable deviation of hot-rolled steel plate, sheet and strip shall comply
with the specifications of GB/T4237.
5 Technical requirements
5.1 Smelting method
Steel shall adopt the primary smelting of molten steel and furnace refining process.
5.2 Chemical composition
5.2.1 The grade, classification and chemical composition (melting analysis) of steels
shall comply with the specifications in Tables 1 to 4. See Annex A for heat-resisting
S31008 06Cr25Ni20 205 515 40 217 95 220
S31608 06Cr17Ni12Mo2 205 515 40 217 95 220
S31609 07Cr17Ni12Mo2 205 515 40 217 95 220
S31708 06Cr19Ni13Mo3 205 515 35 217 95 220
S32168 06Cr18Ni11Ti 205 515 40 217 95 220
S32169 07Cr19Ni11Ti 205 515 40 217 95 220
S33010 12Cr16Ni35 205 560 — 201 92 210
S34778 06Cr18Ni11Nb 205 515 40 201 92 210
S34779 07Cr18Ni11Nb 205 515 40 201 92 210
S38240 16Cr20Ni14Si2 220 540 40 217 95 220
S38340 16Cr25Ni20Si2 220 540 35 217 95 220
a Use A50mm samples when the thickness is not more than 3 mm.
5.4.4 The mechanical properties of annealed ferritic heat-resisting steel plates, sheets
and strips shall comply with the specifications in Table 6.
Table 6 Mechanical properties of annealed ferritic heat-resisting steel plates,
sheets and strips
Unified
digital
code
Stee...
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.