16mm - 30mm Structural Steel Tubing Grade 25 Hot / Cold Finished Seamless Tube
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 |
Q: Are you trading company or manufacturer ?
A: We are factory.
Q: How long is your delivery time ?
A: It is according to quantity. And usually is 35-50 days after receiving 30% T/T in advance.
Q: How to get the sample of structural steel tube ?
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.
Q: What is your terms of payment ?
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 sightGet in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.