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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard supersedes "Stainless Steel Plate, Sheet and Strip for Pressure Equipments " (GB/T, 24511-2009 ); Compared with GB/T, 24511 - 2009 , the main technical changes in this standard are as follows:
- adjust and supply Normative References
- add 16 designations and relevant technical requirements. In them, austenitic stainless steel has 11 designations; Duplex austenitic-ferritic stainless steel has 5 designations. In terms of composition, compared with performance, GB/ 4237, GB/ 3280, GB/ 4238 have higher requirements.
-the thickness tolerance requirements of hot-rolled steel sheet and strip are made stricter and personalized thickness tolerance requirements are supplemented;
-the lower limit value of six common austenitic stainless steel was raised
-in manufacturing method, it defines that hot rolling and heat resistant steel in thickness of 14.0 (mm) ~ 25.0 (mm) shall be delivered in accordance with the requirements of single-rolled steel plate
- steel plate can be produced by using static ingot were defined and the definition of compression volume ratio was made
-the calculation methods for PREN were added;
-the compared test of duplex stainless steel is listed in "special requirement "
-the normative references of grain boundary corrosion test are supplemented;
-Partial S/s S/s high temperature service performance was added in the form of "Informative Appendix"
This standard was proposed by China Iron and Steel Industry Association.
This standard is under the jurisdiction of the National Technical Committee on Iron and Steel of Standardization Administration of China (SAC/TC 183).
The previous editions of this standard replaced are as follows:
-GB/T24511-2009.
Stainless Steel and Heat Resisting Steel Plate, Sheet and Strip for Pressure Equipments
1 Scope
This standard specifies the classification and code number, ordering content, size, shape, weight, technical requirements, test methods, inspection rules, packaging, marks and quality certificates for stainless steel and heat resisting steel plates and strips for pressure equipment.
This standard applies to hot-rolled stainless steel and heat-resisting steel plates and steel strips (including coil cutting steel plates), cold-rolled stainless steel and heat-resistant steel plates and steel strips (including coil cutting steel plates) for pressure-bearing equipment with a width of not less than 600mm.
2 Normative References
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.
GB/T222Permissible variations for Chemical Composition of Steel Products
GB/T223.5Iron Steel and Determination of Acid-soluble Silicon and Total Silicon Content -The Thiocyanate Spectrophotometric Method
GB/T 223.9 Steel and alloys Determination of aluminum content Chrome azure S spectrophotometric method
GB/T223.11 Determination of chromium content in steels and alloys Visual titration or potentiometric titration
GB/T223.16 Methods for chemical analysis of steels and alloys - Determination of titanium by chromotropic acid brightness method
GB/T223.18 Methods for chemical analysis of steels and alloys Sodium thiosulfate separation - Determination of copper by iodimetry
GB/T223.19 Methods for chemical analysis of iron, steel and alloy. The neocuproine chloroform extraction brightness method for the determination of copper content
GB/T223.23 Steels and alloys Determination of nickel content Diacetyldioxime split light method
GB/T223.25 Methods for chemical analysis of iron, steel and alloy - The dimethylglyoxime gravimetric method for the determination of nickel content
GB/T223.26 Steels and alloys Determination of molybdenum content Thiocyanate spectrophotometric method
GB/T223.28 Methods for chemical analysis of steels and alloys - Determination of molybdenum content by weight method with α-benzoin
GB/T223.36 Methods for chemical analysis of steels and alloys - Determination of nitrogen content by distillation separation-neutralization titration
GB/T223.40 Determination of niobium content in steels and alloys
GB/T223.58 Methods for chemical analysis of steels and alloys Determination of manganese by sodium arsenite-sodium nitrite titrimetric method
GB/T223.59 Determination of phosphorus content in steels and alloys: Spectrophotometric method of phosphorous molybdenum blue spectrophotometry and spectrophotometry method
GB/T223.60 Methods for chemical analysis of iron, steel and alloy. Perchloric acid dehydration gravimetric method for the determination of silicon content
GB/T223.68 Methods for chemical analysis of steels and alloys Determination of sulfur content by potassium iodate titration after combustion in a tube furnace
GB/T223.69 Determination of carbon content of steels and alloys
GB/T 228.1 Metallic materials Tensile test Part 1: Test method at room temperature
GB/T230.1 Metallic materials Rockwell hardness test Part 1: Test methods (A, B, C, D, E, F, G, H, K, N, T scales)
GB/T231.1 Brinell hardness test for metallic materials Part 1: Test methods
GB/T232 metal material bending test method
General provisions of GB/T247 steel plate and strip packaging, marking and quality certificates
GB/T708 cold rolled steel plate and strip size, shape, weight and allowable deviation
GB/T709 hot-rolled steel plate and strip size, shape, weight and allowable deviation
GB/T2975 Steel and Steel Products Mechanical Properties Sample Location and Sample Preparation
GB/T4334 Corrosion of metals and alloys Stainless steel intergranular corrosion test method
GB/T4340.1 Metallic materials Vickers hardness test Part 1: Test method
GB/T6394 metal average grain size determination method
GB/T8170 Numerical Rounding Rules and Representation and Determination of Limit Values
GB/T11170 Stainless steel Determination of multi-element content Spark discharge atomic emission spectrometry (conventional method)
GB/T13305 Metallographic determination of α-phase area content in stainless steel
GB/T17505 Steel and Steel Products Delivery General Technical Requirements
GB/T20066 Sampling and preparation method for steel and iron chemical composition test specimens
GB/T20123 Steel - Determination of total carbon and sulfur content - Infrared absorption method after combustion in a high-frequency induction furnace (conventional method)
GB/T20124 Determination of nitrogen content in steels Inert gas fusion heat conduction method (conventional method)
GB/T21433 Intergranular Corrosion Sensitivity Test of Stainless Steel Pressure Vessel
3 Classification and Code
3.1 According to the edge state can be divided into:
a) Trimming EC;
b) Not trimming EM.
3.2 According to the dimensional accuracy can be divided into:
a) thickness accuracy PT.A;
b) Thickness higher accuracy PT.B.
4 Order Content
Contracts or orders placed under this standard should include the following:
a) product name (or product name);
b) brand or code;
c) standard number;
d) size and precision;
e) weight or quantity;
f) surface processing type;
g) delivery status;
h) other special requirements.
5 Size, Shape, Weight
5.1 Dimensions and Allowable Deviations
5.1.1 Size
The nominal size range of steel plates and strips is shown in Table 1. The recommended nominal sizes shall meet the requirements of GB/T708 and GB/T709.(注意shall和should的用詞區別)
Table 1 Nominal Size Range (mm)
Type Nominal thickness Nominal width
Hot-rolled thick steel plate
6.00~100 600~4800
Hot rolled steel plate and strip 2.00~14.0 600~2100
Cold-rolled steel plate, sheet and strip
1.50~8.00 600~2100
5.1.2 Permissible thickness deviation
5.1.2.1 The allowable deviation of the thickness of the hot-rolled thick steel plate shall meet the those specified in Table 2 . As for the thickness greater Than 80.0 (mm) and thicker than 100mm , the allowable deviation of the thickness of the base metal shall be determined through negotiation of the supplier and the buyer.
Table 6 Allowable deviation of the hot-rolled thick steel plate thickness a (mm)
Nominal thickness Nominal width
≤1000 >1000~1500 >1500~2500 >2500
PT.A PT.B PT.A PT.B PT.A PT.B
6.00~8.00 +0.38 +0.35 +0.40 +0.36 +0.50 +0.45 +0.80
>8.00~15.0 +0.45 +0.42 +0.48 +0.44 +0.60 +0.55
>15.0~25.0 +0.50 +0.45 +0.53 +0.48 +0.65 +0.60 +0.98
>25.0~40.0 +0.62 +0.58 +0.67 +0.63 +0.83 +0.78
>40.0~60.0 +0.87 +0.83 +0.92 +0.88 +1.08 +1.03 +1.48
>60.0~80.0 +0.87 +0.83 +0.92 +0.88 +1.38 +1.33
The thickness tolerance of A is -0.30 (mm)
5.1.2.2 Allowable deviations in the thickness of hot-rolled steel plates and strips are to comply with the requirements of Table 3.
Table 3 Hot-rolled steel plate and strip thickness deviations(mm)
Nominal thickness Nominal width
≤1200 >1200~1500 >1500~1800 >1800~2100
PT.A PT.B PT.A PT.B PT.A PT.B PT.A PT.B
2.00~2.50 +0.22
-0.22 +0.20
-0.20 +0.25
-0.25 +0.23
-0.23 +0.29
-0.29 +0.27
-0.27 — —
>2.50~3.00 +0.25
-0.25 +0.23
-0.23 +0.28
-0.28 +0.26
-0.26 +0.31
-0.30 +0.28
-0.28 +0.33
-0.30 +0.31
-0.30
>3.00~4.00 +0.28
-0.28 +0.26
-0.26 +0.31
-0.30 +0.28
-0.28 +0.33
-0.30 +0.31
-0.30 +0.35
-0.30 +0.32
-0.30
>4.00~5.00 +0.31
-0.30 +0.28
-0.28 +0.33
-0.30 +0.30
-0.30 +0.36
-0.30 +0.33
-0.30 +0.38
-0.30 +0.35
-0.30
?
Table 3(mm)
Nominal thickness Nominal width
≤1200 >1200~1500 >1500~1800 >1800~2100
PT.A PT.B PT.A PT.B PT.A PT.B PT.A PT.B
>5.00~6.00 +0.33
-0.30 +0.31
-0.30 +0.36
-0.30 +0.33
-0.30 +0.38
-0.30 +0.35
-0.30 +0.40
-0.30 +0.37
-0.30
>6.00~8.00a +0.38 +0.35 +0.39 +0.36 +0.40 +0.37 +0.46 +0.43
>8.00~10.0a +0.42 +0.39 +0.43 +0.40 +0.45 +0.41 +0.53 +0.49
>10.0~14.0a +0.45 +0.42 +0.47 +0.44 +0.49 +0.45 +0.57 +0.53
For hot rolled steel strips with head and tail delivery, the thickness deviation is not applicable to the abnormal head and tail, and its length is calculated according to the following formula: length (m) = 90 / nominal thickness (mm), but the total length of each roll must not exceed 20m .
A thickness negative deviation is -0.30 mm.
5.1.2.3 As required by the purchaser, it shall be noted in the contract that the thickness deviation of hot-rolled steel plates and strips with a thickness of 6.0 mm or above may be 0, with constant tolerance range(這句前半句類似合同文體, 注意表達方式；同時, 注意理解和把握深層次含義, 避免被原文帶偏).
5.1.2.4 The permissible thickness of steel strip deviation of the cold rolled plate shall meet the requirements of in Table 4.
Table 4 The allowable deviation of cold rolled plate and thickness of steel strip (mm)
Nominal thickness Nominal width
≤1000 >1000~1300 >1300~2100
1.50~2.00 ±0.08 ±0.09 ±0.10
>2.00~2.50 ±0.09 ±0.10 ±0.11
>2.50~3.00 ±0.11 ±0.12 ±0.12
>3.00~4.00 ±0.13 ±0.14 ±0.14
>4.00~5.00 ±0.14 ±0.15 ±0.15
>5.00~6.50 ±0.15 ±0.16 ±0.16
>6.50~8.00 ±0.16 ±0.17 ±0.17
5.1.3 Allowable deviation of width:
5.1.3.1 Hot-rolled thick steel plate shall be trimmed-delivered, and the width permissible tolerance shall meet the requirements of Table 5.
Foreword i
1 Scope
2 Normative references
3 Classification and code
4 Order contents
5 Dimension, shape and weight
6 Technical requirements
7 Test methods
8 Inspection rules
9 Packaging, marking and quality certificate
Annex A (Normative) Density of stainless steel
Annex B (Informative) Comparison table for designations of stainless steel
Annex C (Informative) Heat treatment system of stainless steel
Annex D (Informative) High temperature mechanical properties
Annex E (Informative) High temperature strength of some parts of heat resisting austenitic stainless steels
Bibliography
