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GB/T 38215-2019 English PDF (GB/T38215-2019)
GB/T 38215-2019 English PDF (GB/T38215-2019)
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GB/T 38215-2019: Hot rolled steel strip for structural corrugated steel pipe
GB/T 38215-2019
(Hot rolled steel strip for structural bellows)
ICS 77.140.50
H46
National Standards of People's Republic of China
Hot rolled steel strip for structural bellows
Published on.2019-10-18
2020-09-01 implementation
State market supervision and administration
China National Standardization Administration issued
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Iron and Steel Association.
This standard is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
This standard was drafted. Jiangsu Shagang Group Co., Ltd., Metallurgical Industry Information Standards Institute, Tangshan Jianlong Special Steel Co., Ltd.
The main drafters of this standard. Li Xiaobo, Zhang Shujuan, Zhang Weixu, Hou Jie, Nie Wenjin, Li Qian, Han Jingtao, Zhang Xiuxia, Li Daliang.
Hot rolled steel strip for structural bellows
1 Scope
This standard specifies the designation method, order content, size, shape, weight, technical requirements and test of hot rolled steel strip for structural bellows.
Method, inspection rules, packaging, marking and quality certificate.
This standard is applicable to the production of bridges, culverts, tunnels, underground infrastructure, water supply and drainage, water storage facilities, etc.
The tube is a hot-rolled steel strip (hereinafter referred to as a steel strip) having a thickness of not more than 16 mm.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
Permissible deviation of chemical composition of finished products of GB/T 222 steel
GB/T 223.5 Determination of acid-dissolved silicon and total silicon content - Reducing silyl molybdate spectrophotometric method
GB/T 223.12 Determination of chromium content by sodium carbonate separation - Diphenylcarbazide photometric method
GB/T 223.19 Methods for chemical analysis of steels and alloys - s.
GB/T 223.23 Determination of nickel content in steels and alloys - succinimide spectrophotometric method
GB/T 223.40 Determination of bismuth content of steels and alloys - chlorosulfonol S spectrophotometric method
GB/T 223.59 Determination of phosphorus content of steels and alloys - phosphine molybdenum blue spectrophotometric method and bismuth phosphomolybdenum blue spectrophotometric method
GB/T 223.64 Determination of manganese content in steels and alloys - Flame atomic absorption spectrometry
GB/T 223.68 Steel and alloy chemical analysis method - Determination of sulfur content by potassium iodate titration after combustion in tubular furnace
GB/T 223.69 Determination of carbon content of steel and alloys
GB/T 228.1 tensile testing of metallic materials - Part 1
GB/T 232 metal material bending test method
General provisions for GB/T 247 steel and steel strip packaging, marking and quality certificates
GB/T 709 hot rolled steel sheet and strip size, shape, weight and tolerance
GB/T 2975 steel and steel products mechanical properties test sampling position and sample preparation
GB/T 4336 Determination of multi-element content of carbon steel and medium-low alloy steels by spark discharge atomic emission spectrometry (conventional method)
GB/T 8170 Numerical Rounding Rules and Representation and Determination of Limit Values
General technical requirements for the delivery of GB/T 17505 steel and steel products
GB/T 20066 Sampling and sample preparation method for samples for determination of chemical composition of steel and iron
GB/T 20123 Determination of total carbon and sulfur content of steels - Infrared absorption method after high-frequency induction furnace combustion (conventional method)
3 brand representation
The steel grade is represented by the initial value "Q" of the Chinese character Pinyin, which is the yield strength, and the specified minimum yield strength value and representative use.
The "corrugated" Chinese pinyin initials "BW" consists of three parts.
Example. Q235BW
among them.
Q --- the first letter of the Chinese character of the yield strength of the steel;
235---the specified minimum yield strength value in MPa (MPa);
BW--- represents the first letter of the "ripple" Chinese pinyin for the purpose of use.
4 Ordering content
4.1 Contracts and orders ordered in accordance with this standard shall include the following.
a) standard number;
b) product name;
c) the brand number;
d) size and unevenness accuracy;
e) weight;
f) the diameter of the roll;
g) packaging method;
h) edge state;
i) Other special requirements.
4.2 If the order contract does not specify the edge state, thickness accuracy, packaging method, etc., it will be provided according to the non-cut edge, normal thickness accuracy and the supplier.
The packaging method is available.
5 size, shape, weight
5.1 The dimensions, shape, weight and tolerance of the steel strip shall comply with the provisions of GB/T 709, where the deviation under the thickness is 0 and the tolerance zone is unchanged.
5.2 According to the requirements of the purchaser and specified in the contract, other dimensional precision steel strips may also be supplied.
6 Technical requirements
6.1 Grades and chemical composition
6.1.1 The grade and chemical composition of the steel (melting analysis) shall comply with the requirements of Table 1.
6.1.2 The allowable deviation of the chemical composition of the finished steel strip shall comply with the provisions of GB/T 222.
6.1.3 According to the requirements of the purchaser, the steel strips of other grades and chemical compositions may be supplied upon agreement between the supplier and the buyer and indicated in the contract.
Table 1 Grades and chemical composition
Brand
Chemical composition (mass fraction) /%, not greater than
C Si Mn PS
Q235BW 0.20 0.50 1.40 0.025 0.020
Q295BW 0.22 0.50 1.50 0.025 0.020
Q355BW 0.24 0.50 1.60 0.025 0.020
Note 1. The appropriate amount of Cu, Cr, Ni, Nb and other elements can be added to the steel. The specific type and content are determined by the supplier.
Note 2. When P is added as a corrosion-resistant element, the upper limit of the residual P content in the table at this time is not required.
6.2 Smelting methods
The steel is smelted by an electric furnace or an oxygen converter. Unless the buyer has special requirements and is indicated in the contract, the smelting method is generally selected by the supplier.
6.3 Delivery status
The steel strip is delivered in hot rolled condition.
6.4 Mechanics and process performance
6.4.1 The mechanical and process properties of the steel strip are to comply with the requirements of Table 2.
6.4.2 If the supplier can guarantee the bending performance is qualified, it may not be tested.
Table 2 Mechanical properties and process properties
Brand
Tensile test a
Upper yield strength bReH/MPa
not less than
Tensile strength Rm/MPa
Elongation after break A/%
not less than
180° bending test a, c
Q235BW 235 370~480 26 D=1.5a
Q295BW 295 440~550 24 D=2a
Q355BW 355 470~590 22 D=2a
a Tensile and bending tests take transverse specimens.
b When the yielding phenomenon is not obvious, replace it with the specified plastic elongation strength Rp0.2.
c D is the diameter of the bending head and a is the thickness of the sample.
6.5 Surface quality
6.5.1 The surface of the steel strip shall be free from defects that are harmful to the use, such as cracks, crusting, folding, air bubbles, inclusions and delamination. If the steel strip has the above defects,
Allow cleaning, but the minimum thickness of the steel strip should be guaranteed. The cleaning area should be smooth and free of edges and corners.
6.5.2 The surface of the steel strip is allowed to have local pitting, concave surfaces, scratches and other minor defects with a depth (height) not exceeding half the thickness tolerance of the steel strip.
However, the minimum thickness of the steel strip should be guaranteed.
6.5.3 The strip is allowed to be delivered with defects, but the length of the defective part shall not exceed 6% of the total length of the strip.
6.6 Special requirements
According to the requirements of the purchaser, the inspection of other items such as impact performance can be carried out through agreement between the supplier and the buyer. Inspection methods and specific indicators by supply and demand
Both parties negotiate and indicate in the contract.
7 Test methods
7.1 The chemical composition analysis of steel is usually carried out according to GB/T 4336, GB/T 20123 or other common methods. The arbitration shall be in accordance with GB/T 223.5.
GB/T 223.12, GB/T 223.19, GB/T 223.23, GB/T 223.40, GB/T 223.59, GB/T 223.64, GB/T 223.68,
The provisions of GB/T 223.69 are carried out.
7.2 Each batch of steel strip inspection items and test methods shall comply with the requirements of Table 3.
Table 3 Sampling quantity, sampling method and test method of the inspection item
Serial number test item sampling quantity sampling method test method
1 Chemical analysis 1/furnace GB/T 20066 See 7.1
2 Tensile test 1/batch GB/T 2975 GB/T 228.1
3 Cold bending test 1/batch GB/T 2975 GB/T 232
4 Size, shape - - Suitable measuring tools
5 Surface quality - - Visual inspection
8 Inspection rules
8.1 Inspection and acceptance of steel strips shall be carried out by the supplier's quality supervision and inspection department.
8.2 Steel strips shall be accepted in batches. Each batch shall consist of steel strips of the same grade, the same heat number, the same thickness and the same rolling system.
8.3 The sampling quantity and sampling method of the steel strip shall comply with the requirements of Table 3.
8.4 The re-inspection and determination rules of the steel strip shall comply with the provisions of GB/T 17505.
8.5 The test results of chemical composition and mechanical properties shall be revised by the comparison method of repair value, and the repair rules shall be in accordance with GB/T 8170.
carried out.
9 Packaging, marking and quality certificate
The packaging, marking and quality certificate of the steel strip shall comply with the provisions of GB/T 247. If the party has special requirements for packaging, it should be in the contract.
Note.
9102-
T/
Get Quotation: Click GB/T 38215-2019 (Self-service in 1-minute)
Historical versions (Master-website): GB/T 38215-2019
Preview True-PDF (Reload/Scroll-down if blank)
GB/T 38215-2019: Hot rolled steel strip for structural corrugated steel pipe
GB/T 38215-2019
(Hot rolled steel strip for structural bellows)
ICS 77.140.50
H46
National Standards of People's Republic of China
Hot rolled steel strip for structural bellows
Published on.2019-10-18
2020-09-01 implementation
State market supervision and administration
China National Standardization Administration issued
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Iron and Steel Association.
This standard is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
This standard was drafted. Jiangsu Shagang Group Co., Ltd., Metallurgical Industry Information Standards Institute, Tangshan Jianlong Special Steel Co., Ltd.
The main drafters of this standard. Li Xiaobo, Zhang Shujuan, Zhang Weixu, Hou Jie, Nie Wenjin, Li Qian, Han Jingtao, Zhang Xiuxia, Li Daliang.
Hot rolled steel strip for structural bellows
1 Scope
This standard specifies the designation method, order content, size, shape, weight, technical requirements and test of hot rolled steel strip for structural bellows.
Method, inspection rules, packaging, marking and quality certificate.
This standard is applicable to the production of bridges, culverts, tunnels, underground infrastructure, water supply and drainage, water storage facilities, etc.
The tube is a hot-rolled steel strip (hereinafter referred to as a steel strip) having a thickness of not more than 16 mm.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
Permissible deviation of chemical composition of finished products of GB/T 222 steel
GB/T 223.5 Determination of acid-dissolved silicon and total silicon content - Reducing silyl molybdate spectrophotometric method
GB/T 223.12 Determination of chromium content by sodium carbonate separation - Diphenylcarbazide photometric method
GB/T 223.19 Methods for chemical analysis of steels and alloys - s.
GB/T 223.23 Determination of nickel content in steels and alloys - succinimide spectrophotometric method
GB/T 223.40 Determination of bismuth content of steels and alloys - chlorosulfonol S spectrophotometric method
GB/T 223.59 Determination of phosphorus content of steels and alloys - phosphine molybdenum blue spectrophotometric method and bismuth phosphomolybdenum blue spectrophotometric method
GB/T 223.64 Determination of manganese content in steels and alloys - Flame atomic absorption spectrometry
GB/T 223.68 Steel and alloy chemical analysis method - Determination of sulfur content by potassium iodate titration after combustion in tubular furnace
GB/T 223.69 Determination of carbon content of steel and alloys
GB/T 228.1 tensile testing of metallic materials - Part 1
GB/T 232 metal material bending test method
General provisions for GB/T 247 steel and steel strip packaging, marking and quality certificates
GB/T 709 hot rolled steel sheet and strip size, shape, weight and tolerance
GB/T 2975 steel and steel products mechanical properties test sampling position and sample preparation
GB/T 4336 Determination of multi-element content of carbon steel and medium-low alloy steels by spark discharge atomic emission spectrometry (conventional method)
GB/T 8170 Numerical Rounding Rules and Representation and Determination of Limit Values
General technical requirements for the delivery of GB/T 17505 steel and steel products
GB/T 20066 Sampling and sample preparation method for samples for determination of chemical composition of steel and iron
GB/T 20123 Determination of total carbon and sulfur content of steels - Infrared absorption method after high-frequency induction furnace combustion (conventional method)
3 brand representation
The steel grade is represented by the initial value "Q" of the Chinese character Pinyin, which is the yield strength, and the specified minimum yield strength value and representative use.
The "corrugated" Chinese pinyin initials "BW" consists of three parts.
Example. Q235BW
among them.
Q --- the first letter of the Chinese character of the yield strength of the steel;
235---the specified minimum yield strength value in MPa (MPa);
BW--- represents the first letter of the "ripple" Chinese pinyin for the purpose of use.
4 Ordering content
4.1 Contracts and orders ordered in accordance with this standard shall include the following.
a) standard number;
b) product name;
c) the brand number;
d) size and unevenness accuracy;
e) weight;
f) the diameter of the roll;
g) packaging method;
h) edge state;
i) Other special requirements.
4.2 If the order contract does not specify the edge state, thickness accuracy, packaging method, etc., it will be provided according to the non-cut edge, normal thickness accuracy and the supplier.
The packaging method is available.
5 size, shape, weight
5.1 The dimensions, shape, weight and tolerance of the steel strip shall comply with the provisions of GB/T 709, where the deviation under the thickness is 0 and the tolerance zone is unchanged.
5.2 According to the requirements of the purchaser and specified in the contract, other dimensional precision steel strips may also be supplied.
6 Technical requirements
6.1 Grades and chemical composition
6.1.1 The grade and chemical composition of the steel (melting analysis) shall comply with the requirements of Table 1.
6.1.2 The allowable deviation of the chemical composition of the finished steel strip shall comply with the provisions of GB/T 222.
6.1.3 According to the requirements of the purchaser, the steel strips of other grades and chemical compositions may be supplied upon agreement between the supplier and the buyer and indicated in the contract.
Table 1 Grades and chemical composition
Brand
Chemical composition (mass fraction) /%, not greater than
C Si Mn PS
Q235BW 0.20 0.50 1.40 0.025 0.020
Q295BW 0.22 0.50 1.50 0.025 0.020
Q355BW 0.24 0.50 1.60 0.025 0.020
Note 1. The appropriate amount of Cu, Cr, Ni, Nb and other elements can be added to the steel. The specific type and content are determined by the supplier.
Note 2. When P is added as a corrosion-resistant element, the upper limit of the residual P content in the table at this time is not required.
6.2 Smelting methods
The steel is smelted by an electric furnace or an oxygen converter. Unless the buyer has special requirements and is indicated in the contract, the smelting method is generally selected by the supplier.
6.3 Delivery status
The steel strip is delivered in hot rolled condition.
6.4 Mechanics and process performance
6.4.1 The mechanical and process properties of the steel strip are to comply with the requirements of Table 2.
6.4.2 If the supplier can guarantee the bending performance is qualified, it may not be tested.
Table 2 Mechanical properties and process properties
Brand
Tensile test a
Upper yield strength bReH/MPa
not less than
Tensile strength Rm/MPa
Elongation after break A/%
not less than
180° bending test a, c
Q235BW 235 370~480 26 D=1.5a
Q295BW 295 440~550 24 D=2a
Q355BW 355 470~590 22 D=2a
a Tensile and bending tests take transverse specimens.
b When the yielding phenomenon is not obvious, replace it with the specified plastic elongation strength Rp0.2.
c D is the diameter of the bending head and a is the thickness of the sample.
6.5 Surface quality
6.5.1 The surface of the steel strip shall be free from defects that are harmful to the use, such as cracks, crusting, folding, air bubbles, inclusions and delamination. If the steel strip has the above defects,
Allow cleaning, but the minimum thickness of the steel strip should be guaranteed. The cleaning area should be smooth and free of edges and corners.
6.5.2 The surface of the steel strip is allowed to have local pitting, concave surfaces, scratches and other minor defects with a depth (height) not exceeding half the thickness tolerance of the steel strip.
However, the minimum thickness of the steel strip should be guaranteed.
6.5.3 The strip is allowed to be delivered with defects, but the length of the defective part shall not exceed 6% of the total length of the strip.
6.6 Special requirements
According to the requirements of the purchaser, the inspection of other items such as impact performance can be carried out through agreement between the supplier and the buyer. Inspection methods and specific indicators by supply and demand
Both parties negotiate and indicate in the contract.
7 Test methods
7.1 The chemical composition analysis of steel is usually carried out according to GB/T 4336, GB/T 20123 or other common methods. The arbitration shall be in accordance with GB/T 223.5.
GB/T 223.12, GB/T 223.19, GB/T 223.23, GB/T 223.40, GB/T 223.59, GB/T 223.64, GB/T 223.68,
The provisions of GB/T 223.69 are carried out.
7.2 Each batch of steel strip inspection items and test methods shall comply with the requirements of Table 3.
Table 3 Sampling quantity, sampling method and test method of the inspection item
Serial number test item sampling quantity sampling method test method
1 Chemical analysis 1/furnace GB/T 20066 See 7.1
2 Tensile test 1/batch GB/T 2975 GB/T 228.1
3 Cold bending test 1/batch GB/T 2975 GB/T 232
4 Size, shape - - Suitable measuring tools
5 Surface quality - - Visual inspection
8 Inspection rules
8.1 Inspection and acceptance of steel strips shall be carried out by the supplier's quality supervision and inspection department.
8.2 Steel strips shall be accepted in batches. Each batch shall consist of steel strips of the same grade, the same heat number, the same thickness and the same rolling system.
8.3 The sampling quantity and sampling method of the steel strip shall comply with the requirements of Table 3.
8.4 The re-inspection and determination rules of the steel strip shall comply with the provisions of GB/T 17505.
8.5 The test results of chemical composition and mechanical properties shall be revised by the comparison method of repair value, and the repair rules shall be in accordance with GB/T 8170.
carried out.
9 Packaging, marking and quality certificate
The packaging, marking and quality certificate of the steel strip shall comply with the provisions of GB/T 247. If the party has special requirements for packaging, it should be in the contract.
Note.
9102-
T/
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