GB/T8162 Q235 Carbon Seamless Steel Pipe
GB/T8162 Q235 Carbon Seamless Steel Pipe
Steel Grade/Steel Material: Q345 Q195 10# 20#
Steel pipe standard:GB/8162
Characteristic:
Good concentricity
Good OD and ID tolerance
High Precision
Stable quality
Smooth Roughness
TORICH QUALITY ASSURANCE
Production Processs:
RAW MATERIAL
↓
INCOMING INSPECTION
↓
STORAGE → CUTTING→HAMMERING → PICKING LUBRICATION → CLEANING → PHOSPHORI CLEAN
↓
ENDS CUTTING←STRAIGHTENING←HEAT TREATMENT↔MIDDLLE CHECK↔ COLD DRAWING ← LUBRICATING ↓
FINAL INSPECTION→BUNDING→STORAGE
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% |
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)
Mechanical Properties:
| Steel Grade | Tensile strength Rm N/mm2(MPa) | Yield Strength Rp0.2 N/mm2(MPa) | Elongation A % |
| Wall Thickness |
| ≤16mm | >16~30mm | >30mm |
| 10 | ≥335 | ≥205 | ≥195 | ≥185 | ≥24 |
| 15 | ≥375 | ≥225 | ≥215 | ≥205 | ≥22 |
| 20 | ≥410 | ≥245 | ≥235 | ≥225 | ≥20 |
| 25 | ≥450 | ≥275 | ≥265 | ≥255 | ≥18 |
| 35 | ≥510 | ≥305 | ≥295 | ≥285 | ≥17 |
| 45 | ≥590 | ≥335 | ≥325 | ≥315 | ≥14 |
| 20Mn | ≥450 | ≥275 | ≥265 | ≥255 | ≥20 |
| 25Mn | ≥490 | ≥295 | ≥285 | ≥275 | ≥18 |
| Q235 | A | 375~500 | ≥235 | ≥225 | ≥215 | ≥25 |
| B |
| C |
| D |
| Q275 | A | 415~540 | ≥275 | ≥265 | ≥255 | ≥22 |
| B |
| C |
| D |
| Q295 | A | 390~570 | ≥295 | ≥275 | ≥255 | ≥22 |
| B |
| Q345 | A | 470~630 | ≥345 | ≥325 | ≥295 | ≥20 |
| B |
| C | ≥21 |
| D |
| E |
| Q390 | A | 490~650 | ≥390 | ≥370 | ≥350 | ≥18 |
| B |
| C | ≥19 |
| D |
| E |
| Q420 | A | 520~680 | ≥420 | ≥400 | ≥380 | ≥18 |
| B |
| C | ≥19 |
| D |
| E |
| Q460 | C | 550~720 | ≥460 | ≥440 | ≥420 | ≥17 |
| D |
| E |
Q: Are you trading company or manufacturer ?
A: A professional steel pipes materials inventor, manufacturer and solution provider
Q: How long is your delivery time?
A: Generally it is 7-14 days if the goods are in stock. or it is 30-60 days if the goods are not in stock, it is according to quantity.
Q: Do you provide samples of stainless steel tube ? is it free or extra ?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact us
Product Tags:
|
|
GB/T8162 Q235 Q345 Q195 Carbon Seamless Steel Pipe For Fluid Tube Images
|
