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ASTM A500 Grade B Seamless Steel Pipe
1. Manufacturing Process:
Round to square: make continuous angle deformation of cold-rolled or hot-rolled steel plate directly, and then by high frequency welding form a round steel tube forming method, though the reshaping
finally form a rectangular steel tube forming method. Also known as round to square method.
2. Technical requirements:
1). Chemical Composition:
Yield Strength Grade |
Demotic Raw-material Grade |
235 |
Q235B, Q235C, Q235D, Q235qC, Q235qD |
345 |
Q345A, Q345B,Q345C,Q345D,Q345Qc, Q345Qd, StE355, B480GNQR |
Carbon Equivalent
Ceq(%)=C+Mn/6+Si/24 +Ni/40+Cr/5+Mo/4+V/14
Ⅰgrade product Ceq(%)
Yield Strength Grade |
235 |
345 |
390 |
Ceq(%) |
≤0.36 |
≤0.43 |
≤0.45 |
Note: In order to improve the performance of steel,390 could add the microelement such as V, Nb, Ti, Mo and N etc. | |||
2). Mechanical Property:
Yield Strength Grade |
W.T (mm) |
Yield Strength (Mpa) |
Tensile Strength (Mpa) |
Elongation (%) |
(20°C) Impact Value J |
235 |
4~12>12~22 |
≥235 |
≥375 |
≥23 |
≥27 |
345 |
4~12>12~22 |
≥345 |
≥470 |
≥21 |
≥27 |
390 |
4~12>12~22 |
≥390 |
≥490 |
≥19 |
≥27 |
3). ⅠGrade Product Yield Strength:
Yield Strength Grade |
Outside perimeter (mm) |
Wall Thickness (mm) |
Yield Strength % |
|
Directly to Square |
Round to Square |
|||
235 |
≥800 |
12~22 |
≤80 |
≤90 |
345 | ||||
390 |
≤85 |
≤90 |
||
Note: when the outer perimeter less than 800mm,can be determined by supply and buyer | ||||
3.Application:
1. Machinery manufacture: glass machinery, agricultural machinery, textile machinery, papermaking machinery,
food machinery, electrical equipment, sanitation equipment.
2. Roads and Bridges: railway, aviation, expressway, overpass, road fence, traffic signs.
3. Construction Engineering: steel structure construction, sports venue, three-dimensional garage, exhibition hall.
4. Decoration: wrought iron doors and windows, outdoor advertising, pavilion and vestibule, glass curtain wall.
5. Transportation: automobile manufacture, ship manufacture, container, tricycle, tower crane.
4.Surface Treatment
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