Steel Grade 25 Structural Steel Tubing Hot Rolled / Cold Drawn 16mm - 30mm
Product Details
structural steel tubing
,cold formed steel tube
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% |
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
Reference Standard:
GB/T 222 Tolerance of chemical composition for the steel products.
GB/T 223.3 Chemical analysis method for steel and alloy steel. Two antipyrine methane phosphomolybdate gravimetric method for the determination of phosphorus content.
GB/T 223.5 Chemical analysis method for steel and alloy steel. Reduced silicon molybdate spectrophotometric determination of acid-soluble Silicon Content.
GB/T 223.8 Chemical analysis method for steel and alloy steel. Determination of aluminum content of sodium chloride separated -EDTA volumetric method.
GB/T 223.9 Determination of aluminum content for steel and alloy steel. Chromium Azure S Spectrophotometry.
GB/T 223.11 Chemical analysis method for steel and alloy steel. Determination of chromium content ammonium persulfate oxidation volumetric method.
GB/T 223.12 Chemical analysis method for steel and alloy steel. Spectrophotometric determination of chromium content diphenyl hydrazine - separation of sodium carbonate.
GB/T 223.13 Chemical analysis method for steel and alloy steel. Determination of vanadium content ammonium ferrous sulfate titration.
GB/T 223.14 Chemical analysis method for steel and alloy steel. Tantalum extraction reagent spectrophotometric determination of vanadium content.
GB/T 223.16 Chemical analysis method for steel and alloy steel. Spectrophotometric determination of titanium content chromotropic acid.
GB/T 223.18 Chemical analysis method for steel and alloy steel. Sodium thiosulfate and Separation - iodometry determination of copper content.
GB/T 228 Metallic materials at room temperature tensile test method (GB/T 228-2002,eqv ISO 6892:1998)
GB/T 229 Metal Charpy pendulum impact test method ( GB/T 229-2007, ISO 148-1:2006, MOD)
GB/T 231.1 Brinell hardness test Part 1: testing method (GB/T 231.1-2002, ISO 6506-1:1999, EQV)
GB/T 244 Metal pipe bending test method (GB/T 244-2008, ISO 8491:1996, IDT)
GB/T 246 Test methods for flattening the metal tube (GB/T 246-2007, ISO 8492:1998, IDT)
GB/T 699 Structural carbon steel in good quality.
GB/T 1591 High strength low alloy structural steel
GB/T 1591 High strength low alloy structural steel
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