Cold Formed Special Welded Steel Tube , Seamless Carbon Structural Steel Square Tubing
Cold-Formed Welded and Seamless Carbon Structural Tubing in Rounds and Shapes
Size range:
Square tubes O.D. :20-20 to 500-500 W.T.:1-24mm L:max12000mm
Rectangle tubes O.D. :20-30 to 400-600 W.T.:1-24mm L:max12000mm
| Chemical Reuirement | ||||
| Element | GradeA, b and D | Grade C | ||
| Heat Analysis | Product Analysis | Heat Analysis | Product Analysis | |
| Carbon, max | 0.26 | 0.3 | 0.23 | 0.27 |
| Manganese,max | 1.35 | 1.40 | 1.35 | 1.4 |
| Phosphorus,max | 0.035 | 0.045 | 0.035 | 0.045 |
| Sulfur,max | 0.035 | 0.045 | 0.035 | 0.045 |
| Copper,min | 0.2 | 0.18 | 0.2 | 0.18 |
| Tensil requirements | ||||
| Round Structural Tubing | ||||
| GradeA | Grade B | Grade C | Grade D | |
| Tensil strengths,min,psi(Mpa) | 45 (310) | 58(400) | 62(425) | 58(400) |
| Yield strength,min,psi(Mpa) | 33(230) | 42(290) | 46(315) | 36(250) |
| Elongation in 2 in.(50mm) min,% | 25 | 23 | 21 | 23 |
| Shaped Structural Tubing | ||||
| GradeA | Grade B | Grade C | Grade D | |
| Tensil strengths,min,psi(Mpa) | 45 (310) | 58(400) | 62(425) | 58 |
| Yield strength,min,psi(Mpa) | 39(270) | 46(315) | 50(315) | 36(250) |
| Elongation in 2 in.(50mm) min,% | 25 | 23 | 21 | 23 |
Applications: for construction of bridges, and buildings, and for general strcutrual purposes
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.
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Have questions about our products or want to discuss a custom order? Our team is ready to help you.