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:
Production Method
|
OD Tolerance
|
Hot Rolling(Extrusion)
|
±1% or ±0.50mm
|
Cold Drawn(Cold Rolled)
|
±1% or ±0.30mm
|
Tolerance for wall thickness:
1.Wall thickness tolerance of Hot Rolling steel tube:
Production Method
|
OD (DN)
|
WT/OD
|
Tolerance
|
Extruded tube
|
≤102
|
/
|
±12.5% or ±0.40mm
|
>102
|
≤0.05
|
±15% or ±0.40mm
|
|
>0.05-0.10
|
±12.5% or ±0.40mm
|
||
>0.10
|
+12.5%
-10%
|
||
Heat expanding steel tube
|
/
|
±15%
|
2.Wall thickness tolerance of Cold Drawn(Cold Rolled) steel tube:
Production Method
|
WT
|
Tolerance
|
Cold Drawn(Cold Rolled) steel tube
|
≤3
|
+15%/-10% or ±0.40mm
|
>3
|
+12.5%
-10%
|
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
Product Name
|
Steel Grade 25 Structural Steel Tubing Hot Rolled / Cold Drawn 16mm - 30mm
|
Material
|
alloy steel
|
Section Shape
|
Round
|
Standard
|
GB/T8162
|
Grade
|
20 45 Q345 20Cr 40Cr 20CrMo 30-35CrMo 42CrM
|
Brade
|
Torich
|
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 sight