Product Introduction
At Haihui Steel, we apply our metallurgical and production expertise to manufacture high-performance seamless mechanical pipe products to meet your needs. This includes carbon, alloys and even custom steel grades; annealed, normalized and tempered; stress relieved and stress free; quenched and tempered. Machinery and automotive seamless steel pipes for automobile skeleton and rear axle pipes, manufacturing and processing of precision equipment and instruments. Application: Backbone of Automobile and rear axle tube Manufacturing and processing of precision equipments, instruments and apparatus Delivery Condition: GBK, BKS, BK, BKW, NBK Inspection and Test: Chemical Composition, Mechanical Properties, Visual and Dimension Test, NDT, Grain Size Test Surface Treatment: Oil-dip, Varnish, Shot Blasting
Product Display
Grade and Chemical Composition (%)
| Grade | C | Mn | P≤ | S≤ | Si | Cr | Mo |
| 1010 | 0.08-0.13 | 0.30-0.60 | 0.04 | 0.05 | - | - | - |
| 1020 | 0.18-0.23 | 0.30-0.60 | 0.04 | 0.05 | - | - | - |
| 1045 | 0.43-0.50 | 0.60-0.90 | 0.04 | 0.05 | - | - | - |
| 4130 | 0.28-0.33 | 0.40-0.60 | 0.04 | 0.05 | 0.15-0.35 | 0.80-1.10 | 0.15-0.25 |
| 4140 | 0.38-0.43 | 0.75-1.00 | 0.04 | 0.05 | 0.15-0.35 | 0.80-1.10 | 0.15-0.25 |
Typical Mechanical Properties
| Grade | Condition | Tensile strength | Yield stength | Elongation |
|
|
| Mpa(min) | Mpa(min) | %(min) |
| 1020 | CW | 414 | 483 | 5 |
| SR | 345 | 448 | 10 | |
| A | 193 | 331 | 30 | |
| N | 234 | 379 | 22 | |
| 1025 | CW | 448 | 517 | 5 |
| SR | 379 | 483 | 8 | |
| A | 207 | 365 | 25 | |
| N | 248 | 379 | 22 | |
| 4130 | SR | 586 | 724 | 10 |
| A | 379 | 517 | 30 | |
| N | 414 | 621 | 20 | |
| 4140 | SR | 689 | 855 | 10 |
| A | 414 | 552 | 25 | |
| N | 621 | 855 | 20 |
Minimum Quantities
Hot-finished carbon and alloy—10,000 pounds, or 4,536 kilograms minimum.
Cold-drawn carbon and alloy—5,000 pounds minimum or 125 feet minimum, 2,268 kilograms minimum or 38.1 meters minimum, whichever is greater.
Quantity variation—standard ±10% of the ordered weight, or ±25 feet or 7.61 meters, whichever is greater.
Special Configurations
Tubular Products special seamless tubing configurations start with the highest quality steels. Grade, chemical analysis and surface condition are carefully considered, and production processes are tailored to achieve the best tubing for the end use.
The configurations are formed from round tube by cold drawing. The tube is drawn over a shaped mandrel or through a shaped die, or both. Improved tolerances, finishes and mechanical properties result.
Seamless and welded tubes for mechanical and general engineering applications. Tubes for construction and structural purposes such as civil structures, foundations, etc.
| Standard | Steel Grade | |
| EN | 10297 | E355 |
| 10210-1/2 | S235JRH, S275JOH, S275J2H, S355JOH, S355J2H | |
| 10219-1/2 | ||
| DIN | 1629/2448 | St-52 |
| ASTM | A500 | Gr. A, Gr. B |
| A501 | ||
| A618 | Gr. I, Gr. II, Gr. III | |
Dimensional Tolerance
| Supply Conditions | Steel Tubes Provided according to Outside Diameter and Wall Thickness | Steel Pipes Provided according to Outside Diameter, Inside Diameter and Wall Thickness | Steel Tubes with the Outside Diameter of 77 mm, Inside Diameter of 57 mm and the Wall Thickness of 10 mm | ||||
| Allowable Deviation of Diameter and Wall Thickness | Size (mm) | Allowable Deviation (%) | Size | Allowable Deviation | Size | Allowable Deviation | |
| Outside Diameter | ±1.0 | Outside Diameter | ±1.0% | Outside Diameter | +1.0 mm-0.55 mm | ||
| Wall Thickness | ≤ 7 | 6 | |||||
| ﹥7-15 | 2.5 | Inside Diameter | ±1.75% | Inside Diameter | +1.5 mm-0.5 mm | ||
| ﹥15 | 5 | Wall-Thickness-Difference | ≤ 15% of Nominal Wall Thickness | Wall-Thickness-Difference | ≤ 15% of Nominal Wall Thickness | ||