This standard specifies the classification, code, shape, size and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of cold-drawn special-shaped steel tubes. This standard is applicable to simple cross-section special-shaped steel tubes made of carbon structural steel, high-quality carbon structural steel and low-alloy high-strength structural steel for structural use. GB/T 3094-2000 Cold-drawn special-shaped steel tubes GB/T3094-2000 standard download decompression password: www.bzxz.net

ICS 77.140.75
National Standard of the People's Republic of China
GBT 3094--2006
Cold drawn shaped steel tubes
Cold drawn shaped steel tubes2000- 10-25 Issued
200109-01 Implementation
Issued by the State Administration of Quality and Technical Supervision
GB/T3094-2000
This standard adopts the American ASTM A500-1990 "Carbon steel cold-formed circular and shaped welded tubes and continuous steel tubes for structural use" in a non-equivalent manner. The main difference is that the product varieties are increased and the main performance indicators are improved. This standard is a revision of the original GB/T 3094--1982 "Cold drawn seamless shaped steel tubes". The negotiation clauses for steel grade, specification, size deviation and length are added. A variety of delivery states are adopted, and explosion-welded steel pipes are allowed. The appendix A and appendix B of this standard are the appendices of the standard. This standard replaces CB/T3094-1982 Cold-drawn Seamless Special-shaped Steel Pipes from the date of implementation. This standard is proposed by the State Metallurgical Industry Bureau and is approved by the National Copper Standardization Technical Committee. The drafting unit of this standard is Shanghai Yigang Special-shaped Steel Pipe Co., Ltd. The main drafters of this standard are Jiang Chao, Hao Zhenchuan, and Wang Liangqiu. This standard was first issued in May 1982. 1 Scope
National Standard of the People's Republic of China
Cold drawn shaped steel tubes
Cold drawn shaped steel tubesGB/T 3094 -2000
Replaces GB/T 3094--1982
This standard specifies the classification, code, shape, size and allowable deviation, technical requirements, test methods, inspection rules, handling, marking and quality certification of cold drawn shaped steel tubes
This standard applies to simple cross-section shaped steel tubes (referred to as steel tubes) made of carbon structural steel, high-quality carbon structural steel and low-alloy high-strength structural steel for structural use.
2 Referenced Standards
The texts contained in the following references constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 222-1984 Sampling method for chemical analysis and allowable deviation of chemical composition of finished products GB3/T 223.5-1997 Chemical analysis methods for steel and alloys - Reduced molybdenum silicate photometric method for the determination of acid-soluble silicon content (G3/T 223. [2--1991
G3/T 223. 14.--1989
GB/T 223. 17--1989
G3/1 223. 19--1989
GB/T 223. 23:1994
GB/ 223.40 1985
G3/T 223, 59 1987
G8/T 223. 60 - 1997
GB/T 223. 63--I988
GB/T 223. 68—199?
G3/ I 223. 69--1997
G13/T 228 ---1987
GR/T 619 ---1999
Methods for Chemical Analysis of Iron, Steel and Alloys; Sodium Carbonate Separation-Diphenylcarbazide Photometric Determination of Chromium Content; Chemical Analysis of Iron, Steel and Alloys;|tt||Vanadium Content by Extraction Photometric Determination of Vanadium Content;|tt||Methods for Chemical Analysis of Iron, Steel and Alloys;|tt||Photometric Determination of Titanium Content by Antipyrine Extraction Photometric Determination of Copper Content by New Cuproline-Trifluoroethane Extraction Photometric Determination of Nickel Content by Dimethoate Spectrophotometric Determination of Nickel Content;|tt||Methods for Chemical Analysis of Steel and Alloys;|tt||Methods for Chemical Analysis of Iron, Steel and Alloys;|tt||Methods for Chemical Analysis of Iron, Steel and Alloys;|tt||Methods for Chemical Analysis of Iron, Steel and Alloys Analytical method
Chemical analysis methods for steel and alloys
Ion exchange separation-sulfurized phenol S photometric determination of niobium content Antimony phosphorus platinum blue photometric determination of phosphine content
Perchloric acid dehydration heavy daptomycin determination of silicon content
Chemical analysis methods for steel and alloys
Sodium (potassium) periodate photometric determination of manganese content
Chemical analysis methods for steel and alloys Potassium iodate ionization method after combustion in a tubular furnace to determine sulfur content Chemical analysis methods for steel and alloys
Metal tensile test method
High quality carbon steel structural steel
GH/T 700-1988
Carbon steel
GB/T1591-199 Low alloy high strength steel GB/T 2102-1988
GB/I ​​6397-1486
3 Classification and code
Determination of carbon content by gas volumetric method after combustion in tubular furnace Acceptance, packaging and marking of steel pipes Quality certificate Metal tensile test specimens
The classification of steel pipes is as follows:
Approved by the State Administration of Quality and Technical Supervision on 200010-25, 2001-09 01 Implementation
Square steel pipe
Rectangular steel pipe
Oval steel pipe
Flat oval steel pipe
Inside and outside hexagonal steel pipe
Right-angle trapezoidal steel pipe
Appearance, size and allowable deviation
GB/T30942000
4.1 The appearance, size and cross-sectional characteristics of steel pipes shall be in accordance with the provisions of Figures A1 to A6 and Table A6 (see Appendix A) respectively. After consultation between the supply and demand parties, the products can also be produced as shown in Figures A1 to A6 and Table HINA
4.2 Allowable deviation of steel pipe dimensions
Allowable deviation of steel pipe dimensions
Side length:
Wall thickness:
Note: The shapes and specifications other than the allowable deviation of dimensions in Table A6 shall be specified in the contract. After agreement between the supply and demand parties, the products can be produced as shown in Table 1
4.3 Concavoconvexity of steel pipe edges
Side length dimension
>30~50
>50--75
Table 2
Allowable deviation of dimensions
General grade||tt ||If specified, it shall be delivered as ordinary grade
Steel pipe with dimension deviation
Table 2 Edge convexity
Edge concavity
Ordinary grade
Note: The grade shall be specified in the contract. If not specified, it shall be delivered as ordinary grade. The outer fillet radius (R) of the steel pipe end face shall comply with the provisions of Table 34.4
Table 3 Outer fillet radius
Thickness S
Outer four corner radius R
4.5 Length
±070%
±080%
GB/T30942000
4.5.1 The normal length of steel pipe is 1500~9000mm. 4.5.2 The length of fixed length and multiple length shall be within the normal length range. The allowable deviation of the fixed length is +15, and the allowable deviation of the full length of the multiple length is +10. A 510mm cut margin should be left for each multiple length. 4.6 Curvature
The curvature of the steel pipe shall comply with the provisions of Table 4. Table 4 Curvature
Accuracy grade
Ordinary grade
Curvature, mm/m
Note: The accuracy grade should be specified in the contract. If not specified, it shall be delivered according to the ordinary grade. 4.7 Torsion value
Total curvature, %
The reported torsion value of long rectangular steel pipes and right-angle trapezoidal steel pipes shall comply with the provisions of Table 5. Special-shaped steel pipes shall not have significant torsion.
The method for determining the torsion value is shown in Appendix B
Side length of the pipe
4.8If the supply and demand parties also
4.9End shape
Two end faces of the steel pipe
4.10Weight
Batch transfer
Allowed torsion amount
Steel pipes with other sizes, lengths, curvatures and torsion values ​​than those specified in this standard may also be produced if specified in the contract. The pipe axis is vertical and the burrs are removed. The steel pipe is delivered according to the actual weight. 4.11 Marking example 20 steel, the long side is 50. 20 steel D-250× (steel density is 7.85g/dn) The contract specifies that the theoretical weight can be used. The short side is 40mm. The wall thickness is 3mm. The wall thickness accuracy grade is high-grade rectangular pipe, which is marked as: high-GB/T3094. Technical requirements Steel grades and chemical composition Steel grades are 10, 20, 35, 595Q215Q235 steel: Q293, Q36 and Q306 steel, and its chemical composition (melting content 00.The chemical composition of the finished steel skeleton shall comply with the provisions of GB/222.
According to the requirements of the buyer, other grades of steel pipes can also be produced after the agreement between the supplier and the buyer. 5.2 Manufacturing method
The steel pipe is cold-made with seamless steel pipes. It can also be cold-drawn with welded steel pipes as specified in the contract. 5.3 Delivery status
The steel pipe is delivered in a cold-drawn state. According to the requirements of the buyer, it can also be delivered in a heat-treated state as specified in the contract. 5.4 Mechanical properties
For steel pipes delivered in a cold state, no mechanical property test is performed. When delivered in a heat-treated state, its mechanical properties shall comply with the provisions of Table 6. 5.5 Surface quality
There shall be no cracks, folds and scars on the inner and outer surfaces of the steel pipe. These defects shall be completely removed, and the removal depth shall not exceed 3
GB/T30942000
negative deviation of the nominal wall thickness. The actual wall thickness at the removal point shall not be less than the minimum value allowed by the wall thickness. Other defects that do not exceed the negative difference of the wall thickness are allowed to exist. The inner and outer surfaces of the steel pipe delivered in the cold-processed state are allowed to have an adhesion layer of phosphates and lubricants from the manufacturing process. Upon the request of the purchaser, the contract shall specify that the supplier shall remove the internal burrs of the cold-drawn welded steel pipe for structure. When there are special requirements, the height of the internal burrs shall be negotiated between the supply and demand parties. The contract shall specify the test method and sampling quantity of the steel pipe in Table 6 Mechanical properties
Tensile strength
Test method
The yield point specified in Table 7 shall be met. ,
not less than
Table 7 Test methods and sampling quantity
Inspection items
Chemical composition
Surface quality
Geometric dimensions
Torsion value
Edge convexity
Tensile test
Test method
GB/T222, GB/T223
The most accurate
Appendix A
Ruler, ruler
GB/T228, GB/T6397
Elongation after fracture 0
Sampling quantity
One for each furnace (melting)
Take one specimen from each batch on each of the two steel pipes. The measurement position of side length, side convexity and torsion value shall be at a position at least the maximum side length away from both ends of the steel pipe, but not less than 5Cmm. The wall should be measured at the position outside the steel pipe corner. Inspection rules
Inspection and acceptance
Inspection and acceptance of steel pipes shall be carried out by the supplier's technical supervision department. 7.2 Batch rules
Steel pipes shall be inspected and accepted in batches. Each batch shall consist of copper pipes of the same brand, furnace number, specification and heat treatment furnace (such as heat treated GB/T3094--2000
). The quantity of each batch of steel pipes is stipulated as follows: steel pipe section length ≤240mm, 400 pieces per batch; steel pipe section circumference>240mm, ≤200 pieces per batch. 7.3 Re-inspection and judgment rules
The re-inspection and judgment rules of steel pipes shall comply with the relevant provisions of GB/T 2102. Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel pipes shall comply with the relevant provisions of GB/T 2102. GB/T3094-2000
The quantity of each batch of steel pipes is as follows: 400 pieces per batch for a steel pipe section circumference of 240mm, ≤200 pieces per batch for a steel pipe section circumference of 24mm. 7.3 Re-inspection and determination rules
The re-inspection and determination rules for steel pipes shall comply with the relevant provisions of GI3/T2102. Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel pipes shall comply with the relevant provisions of GB/T2102. 5
Basic dimensions
GB/T 3094 2000
Table A1 (continued)
Cross-sectional area
Theoretical weight
Moment of inertia
Section modulus
GB/T 3094 2000
Table A1 (continued)
Cross-sectional area
Theoretical weight
Moment of inertia
Section modulus
W x --
GB/T 30942000
Table A1 (continued)
Cross-sectional area
Theoretical weight
Moment of inertia
Section modulus
131,84
192,23
Basic dimensions
GB/T30942000
Table A1 (continued)
Cross-sectional area
Theoretical weight
9:82
Moment of inertia
166189
1922731
Section modulus
125,473 Re-inspection and judgment rules
The re-inspection and judgment rules of steel pipes shall comply with the relevant provisions of GB3/T2102. Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel pipes shall comply with the relevant provisions of GB/T2102. 5
Basic dimensions
GB/T30942000
Table A1 (continued)
Cross-sectional area
Theoretical weight
Moment of inertia
Section modulus
GB/T 3094 2000
Table A1 (continued)
Cross-sectional area
Theoretical weight
Moment of inertia
Section modulus
W x --
GB/T 30942000
Table A1 (continued)
Cross-sectional area
Theoretical weight
Moment of inertia
Section modulus
131,84
192,23
Basic dimensions
GB/T30942000
Table A1 (continued)
Cross-sectional area
Theoretical weight
9:82
Moment of inertia
166189
1922731
Section modulus
125,473 Re-inspection and judgment rules
The re-inspection and judgment rules of steel pipes shall comply with the relevant provisions of GB3/T2102. Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel pipes shall comply with the relevant provisions of GB/T2102. 5
Basic dimensions
GB/T30942000
Table A1 (continued)
Cross-sectional area
Theoretical weight
Moment of inertia
Section modulus
GB/T 3094 2000
Table A1 (continued)
Cross-sectional area
Theoretical weight
Moment of inertia
Section modulus
W x --
GB/T 30942000
Table A1 (continued)
Cross-sectional area
Theoretical weight
Moment of inertia
Section modulus
131,84
192,23
Basic dimensions
GB/T30942000
Table A1 (continued)
Cross-sectional areawww.bzxz.net
Theoretical weight
9:82
Moment of inertia
166189
1922731
Section modulus
125,47
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