GB/T 24511-2017 PDF English
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| GB/T 24511-2017 | English | 315 |
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Stainless steel and heat resisting steel plate, sheet and strip for pressure equipment
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| GB 24511-2009 | English | 85 |
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[GB/T 24511-2009] Stainless steel plate, sheet and strip for pressure equipment
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GB/T 24511-2017: Stainless steel and heat resisting steel plate, sheet and strip for pressure equipment
---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/GBT24511-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Replacing GB/T 24511-2009
Stainless steel and heat resisting steel plate, sheet
and strip for pressure equipments
Issued on. DECEMBER 29, 2017
Implemented on. SEPTEMBER 01, 2018
Issued by. General Administration of Quality Supervision Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Classification and code... 8
4 Order content... 8
5 Dimensions, appearance, weight... 8
6 Technical requirements... 14
7 Test method... 23
8 Inspection rules... 25
9 Packaging, marking and quality certificate... 26
Appendix A (Normative) Density value of stainless-steel... 27
Appendix B (Informative) Comparison of stainless-steel designations... 28
Appendix C (Informative) Heat treatment system of stainless-steel... 31
Appendix D (Informative) High temperature mechanical properties... 33
Appendix E (Informative) High temperature strength of some austenitic heat-
resisting stainless-steel... 34
References... 36
1 Scope
This standard specifies the classification and code, order content, size, shape,
weight, technical requirements, test methods, inspection rules, packaging,
marking, quality certificates of stainless-steel and heat resisting steel plate,
sheet and strip for pressure equipments.
This standard applies to hot-rolled stainless-steel and heat resisting steel plate,
sheet and strip (including coil-cut steel plates), cold-rolled stainless-steel and
heat resisting steel plate, sheet and strip (including coil-cut steel plates) for
pressure equipment which has a width of not less than 600 mm.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total
silicon content - Reduced molybdosilicate spectrophotometric method
GB/T 223.9 Iron steel and alloy - Determination of aluminum content -
Chrome 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 spectrophotometric 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
3 Classification and code
3.1 According to the edge state, it can be divided into.
3.2 According to dimensional accuracy, it can be divided into.
4 Order content
The contract or order placed in accordance with this standard shall include the following.
a) Product name (or item);
b) Designation or code;
c) Standard number;
d) Size and accuracy;
e) Weight or quantity;
f) Surface processing type;
g) Delivery status;
h) Other special requirements.
5 Dimensions, appearance, weight
5.1 Dimensions and allowable deviation
5.1.1 Dimensions
The nominal size range of steel plate strip is as shown in Table 1.The
recommended nominal size shall meet the requirements of GB/T 708 and GB/T 709.
5.1.3 Allowable deviation of width
5.1.3.1 The hot-rolled thick steel plate shall be delivered after trimmed; the
allowable deviation of width shall meet the requirements of Table 5.
Table 5 (continued), in mm
5.1.3.2 The hot-rolled coil-cut steel plate shall be delivered after trimmed. The
allowable deviation of the width of the trimmed hot-rolled steel sheet and steel
strip, as well as the coil-cut steel sheet shall meet the requirements in Table 6.
The allowable deviation of the width of the non-trimmed hot-rolled steel strip
shall be negotiated between the supplier and the buyer.
5.1.3.3 Cold-rolled steel plates and steel strips shall be delivered after trimmed.
The allowable deviation of width shall meet the requirements of Table 7.
5.1.4 Allowable deviation of length
The allowable deviation of the length of hot-rolled thick steel plate, hot-rolled
coil-cut steel plate, cold-rolled coil-cut steel plate shall meet the requirements of Table 8.
5.2 Appearance
5.2.1 Sickle bend
The sickle bend of hot-rolled thick steel plate, hot-rolled steel strip and coil-cut
steel plate, cold-rolled steel strip and coil-cut steel plate shall meet the
requirements of Table 9.
5.2.2 Cutting slope
5.2.3 Unevenness
5.2.4 Tower shape
5.2.4.1 Tower shape. the phenomenon that the edges of the steel coil are not
in the same vertical plane during the coiling process, as shown in Figure 1.
5.2.4.2 The steel coil shall be firmly formed into a coil and try to keep cylindrical
and not crimped.
5.2.4.3 The tower shape of the hot-rolled trimmed steel coil shall not be larger
than 30.0 mm; the tower shape of the cold-rolled trimmed steel coil shall not be
larger than 20.0 mm.
5.2.4.4 The tower shape of untrimmed steel coils shall not be larger than 70.0 mm.
5.3 Weight
5.3.1 Weight of steel plate
Steel plates are delivered according to theoretical or actual weight. When
calculating the theoretical weight, use the nominal size of the steel plate for
calculation, but the calculated thickness is the arithmetic average of the
maximum and minimum allowable thickness of the steel plate. See Appendix A
for the density of stainless-steel.
5.3.2 Weight of steel strip
The steel strip is delivered according to actual weight.
6 Technical requirements
6.1 Manufacturing method
6.1.1 Use crude molten steel for refining outside the furnace.
6.1.2 The compression ratio of the continuous casting billet or steel ingot shall
not be less than 3.
6.1.3 Hot-rolled stainless-steel and heat-resisting steel coils which have a
thickness of 14.0 mm ~ 25.0 mm may be flattened in the hot-rolled state and
subjected to single-sheet heat treatment, before they can be delivered in
accordance with the standard of single sheet medium plate.
6.2 Chemical composition
6.2.1 The steel designation and chemical composition (melting analysis) shall
meet the requirements of Table 13 ~ Table 15.Refer to Appendix B for the
comparison of stainless-steel designations.
6.2.2 The allowable deviation of the chemical composition of the finished
product of steel plates and steel strips shall meet the requirements of GB/T 222.
6.2.3 Stainless-steel pitting equivalent number PREN = Cr% + 3.3Mo% + 16N%.
6.3 Delivery status
After cold rolling or hot rolling of steel plates and steel strips, refer to Appendix
C for heat treatment; deliver them after pickling or similar treatment.
6.4 Mechanical properties and process properties
6.4.1 The room temperature mechanical properties of heat-treated steel plates
and strips shall meet the requirements of 6.4.2 ~ 6.4.For several different
hardness tests, one of the methods can be tested according to the different
sizes and conditions of steel plates and strips.
6.4.2 The room temperature mechanical properties of the solid-solution-treated
austenitic stainless-steel shall meet the requirements of Table 16.
6.4.3 For hot-rolled thick steel plates, when the thickness exceeds the
maximum thickness as specified in Table 2, the mechanical property test can
be carried out after negotiation between the supplier and the buyer. The test
data is for reference only and not as a basis for delivery.
6.4.4 The room temperature mechanical properties of the austenitic-ferritic steel
after solid-solution treatment shall meet the requirements of Table 17.
6.4.5 The room temperature mechanical properties and process properties of
the annealed ferritic steel shall meet the requirements of Table 18.
6.4.6 For the bending test of the annealed ferritic steel, the inspection shall be
carried out only when required by the purchaser and specified in the contract.
6.4.7 Refer to Appendix D and Appendix E for the high temperature mechanical
properties of some designations.
6.6 Grain size
According to the requirements of the buyer, as negotiated between the supplier
and the buyer and indicated in the contract, the stainless-steel whose
designation is 07Cr19Ni10, 07Cr17Ni12Mo2, 07Cr19Ni11Ti, 07Cr18Ni11Nb
can be subject to the grain size testing. The level of average grain size shall be 7 or coarser.
6.7 Surface processing and quality requirements
6.7.1 Surface processing types of steel plates and strips
The surface processing types of steel plates and strips are as shown in Table
19.The purchaser shall specify the processing type according to the use
requirements and indicate in the contract.
6.7.2 Surface quality
6.7.2.1 Surface quality of hot-rolled thick steel plates, hot-rolled steel
strips, coil-cut steel plates
Steel plates and steel strips are not allowed to have defects that affect their use.
The surface of steel plate and steel strip after pickling is not allowed to have
oxide scale or over pickling. It is allowed to grind and clean local defects on the
surface of the steel plate, but the minimum thickness of the steel plate shall be
guaranteed. Since steel strips generally have no chance of removing defects, it
is allowed to have a small amount of abnormal parts.
6.7.2.2 Surface quality of cold-rolled steel strip and coil-cut steel plate
6.8 Special requirements
6.8.1 According to the requirements of the buyer and after the agreement
between the supplier and the buyer, special technical requirements can be
specified for the chemical composition, mechanical properties, non-metallic
inclusions of the steel plate and steel strip, or special inspection items such as
corrosion resistance test and non-destructive testing can be supplemented. The
test method and qualification level shall be determined through negotiation
between the supplier and the buyer and indicated in the contract.
6.8.2 According to the requirements of the purchaser and specified in the
contract, the comparison test of austenitic-ferritic stainless-steel is carried out
in accordance with GB/T 13305, requiring a ferrite content of 40% ~ 60%.
7 Test method
7.1 The inspection items and test methods of each batch of steel plates and
strips shall meet the requirements of Table 20.
7.2 The chemical composition analysis method of steel is in accordance with
GB/T 223.5, GB/T 223.9, GB/T 223.11, GB/T 223.16, GB/T 223.18, GB/T
223.19, GB/T 223.23, GB/T 223.25, GB/T 223.26, GB/T 223.28, GB/T 223.36,
GB/T 223.40, GB/T 223.58, GB/T 223.59, GB/T 223.60, GB/T 223.68, GB/T
223.69, GB/T 11170, GB/T 20123, GB/T 20124 or general methods. However,
the arbitration shall be conducted in accordance with GB/T 223.5, GB/T 223.9,
GB/T 223.11, GB/T 223.16, GB/T 223.18, GB/T 223.19, GB/T 223.23, GB/T
223.25, GB/T 223.26, GB/T 223.28, GB/T 223.36, GB/T 223.40, GB/T223.58,
GB/T 223.59, GB/T 223.60, GB/T 223.68, GB/T 223.69.
7.3 Measurement method of size and shape
7.3.1 Dimension measurement
7.3.1.1 Thickness measurement
7.3.1.2 Width measurement
Width measurement position. Perpendicular to the rolling direction, except for
the abnormal part of the head and tail of untrimmed steel strip.
7.3.2 Shape measurement
7.3.2.1 Sickle bend
The measurement method is as shown in Figure 2, except for the abnormal part
of the head and tail of untrimmed steel strip.
Description.
7.3.2.3 Unevenness of steel plate
8 Inspection rules
8.1 The quality inspection of steel plates and strips is the responsibility of the
supplier's quality supervision department.
8.3 The sampling quantity and sampling location of each batch of steel plates
and strips shall meet the requirements of Table 20.
8.4 The re-inspection and determination of other inspection items shall meet
the requirements of GB/T 17505.
8.5 The test results of mechanical properties and chemical composition shall
be rounded off using the rounding value comparison method; the rounding off
rules shall be implemented in accordance with the provisions of GB/T 8170.
9 Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel plates and strips shall
meet the requirements of GB/T 247.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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