16mm - 30mm Steel Grade 25 Hot Rolled / Cold Drawn Seamless Tube Structural Steel Pipes
GB/T8162 Structural Seamless Steel Tube with Steel Grade 20 45 Q345 20Cr 40Cr 20CrMo 30-35CrMo 42CrM
Heat Treatment: Hot Rolling & Cold Drawn
Tolerance of the OD &WT:
OD Tolerance:
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Production Method
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OD Tolerance
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Hot Rolling(Extrusion)
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±1% or ±0.50mm
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Cold Drawn(Cold Rolled)
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±1% or ±0.30mm
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Tolerance for wall thickness:
1.Wall thickness tolerance of Hot Rolling steel tube:
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Production Method
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OD (DN)
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WT/OD
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Tolerance
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Extruded tube
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≤102
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/
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±12.5% or ±0.40mm
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＞102
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≤0.05
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±15% or ±0.40mm
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＞0.05-0.10
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±12.5% or ±0.40mm
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||
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＞0.10
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+12.5%
-10%
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||
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Heat expanding steel tube
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/
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±15%
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2.Wall thickness tolerance of Cold Drawn(Cold Rolled) steel tube:
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Production Method
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WT
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Tolerance
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Cold Drawn(Cold Rolled) steel tube
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≤3
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+15%/-10% or ±0.40mm
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＞3
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+12.5%
-10%
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Mechanical Property:
Bending tolerance:
WT≤15mm, Bending≤1.5mm/m
WT＞15mm~30mm, Bending≤2.0mm/m
WT＞30mm/OD≥351mm, Bending≤3.0mm/m
Ovality and Wall unevenness:
The ovality and wall unevenness should be no more than 80% of the OD and wall thickness.(Or according to customer’s request)
Test:
Bending test
Hardness test
Impact test
Squeezing test
Non-destructive test
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Product Name
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Steel Grade 25 Structural Steel Tubing Hot Rolled / Cold Drawn 16mm - 30mm
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Material
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alloy steel
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Section Shape
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Round
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Standard
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GB/T8162
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Grade
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20 45 Q345 20Cr 40Cr 20CrMo 30-35CrMo 42CrM
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Brade
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Torich
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A: We are factory.
A: It is according to quantity. And usually is 35-50 days after receiving 30% T/T in advance.
A:
1.You are requested to pay for sample charges and courier charges from China to your country; and the free sample is according the product like size, steel grade and quantity, please consult our sales for details
2.Sample charges will be refunded when order is placed.
A:
1.T/T: 30% deposit in advance, the balance 70% paid before shipment
2.30% down payment, the balance 70% paid against L/C at sightOur products are sold all over the world, you can rest assured.
