GB/T 8162 20Mn 25Mn Q235 Q345 Seamless Steel Tubes for Structural Purposes
Product Details
seamless steel pipe
,precision stainless steel tubing
Seamless Steel Tubes for Structural Purposes GB/T 8162
Spec:
Material:10# 20# 45# 20Mn 25Mn Q235 Q345
Size Range:
OD:3-1200mm, WT:0.5-200mm, General Length:3-12m
Tolerance:
According to the following tables or customers’ request.
Characteristic:
Good concentricity
Good OD and ID tolerance
High Precision
Stable quality
Smooth Roughness
TORICH QUALITY ASSURANCE
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 property
| 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 | ||||||
Test:
- Bending test
- Hardness test
- Impact test
- Squeezing test
- Non-destructive test
Processing:
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
Technical Delivery Conditions:Heat Treatment with Hot Rolling & Cold Drawn
Widely used in the field of:Transporting water,gas,oil etc
QUALITY CONTROL
1~ Incoming Raw Material Inspection
2~ Raw Material Segregation to avoid steel grade mix-up
3~ Heating and Hammering End for Cold Drawing
4~ Cold Drawing and Cold Rolling, on line inspection
5~ Heat Treatment, +A, +SRA, +LC, +N, Q+T
6~ Straightening-Cutting to specified length-Finished Measuring Inspection
7~ Machanical Testing in own labs with Tensile Strength, Yield Strength, Elongation, Hardness, Impact, Mictrostruture etc
8~ Packing and Stocking.
100% of our steel tubes are dimensionally checked
100% of our steel tubes are visually checked to assure they have a perfect surface condition and no surface defects.
100% eddy current test and ultrosonic test to eliminate longitudinal and transversal defects.
Product Images:
FAQ
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, and it is according to quantity.
Q: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample for free charge but you need to 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
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