Cangzhou Zhongrun Steel Pipe Co., Ltd., founded in 1994, is located in the beautiful coastal city - Changzhou.The main products:seamless steel pipe,ERW line pipe,LSAW,SSAW and Alloy steel pipe,annual sales of 100,000 tons.
In 2012 my company invested Hengchang Steel Pipe Manufacturing Co., Ltd.in Cangzhou City, the company covers an area of 100 acres, a total of eight pipe production line,annual production of about 40,000 tons.
My company to provide you with quality products and dedicated service, welcome to visit our company.
Chemical Composition
| Pipe/Steel grade | C(%)≤ | Si(%)≤ | Mn(%)≤ | P(%)≤ | S(%)≤ | V(%)≤ | Nb(%)≤ | Ti(%)≤ | CEiiw(%)≤ | CEpcm(%)≤ |
| L290/X42 | 0.24 | 0.45 | 1.4 | 0.025 | 0.015 | 0.06 | 0.05 | 0.04 | 0.43 | |
| L360/X52 | 0.24 | 0.45 | 1.5 | 0.025 | 0.015 | 0.1 | 0.05 | 0.04 | 0.43 | |
| L415/X60 | 0.24 | 0.45 | 1.7 | 0.025 | 0.015 | 0.1 | 0.05 | 0.04 | 0.25 | |
| L450/X65 | 0.18 | 0.45 | 1.7 | 0.025 | 0.015 | g | g | g | 0.25 | |
| a.The CEiiw limits apply if C>0.12% and the CEpcm limits apply if C≤0.12% | ||||||||||
| g.Unless otherwise agreed,Nb+V+Ti≤0.15% | ||||||||||
Tensile Properties
| Pipe/Steel grade | Yield strength(Mpa) | Tensile strength(Mpa) | ||
| minimum | maximum | minimum | maximum | |
| L290/X42 | 290 | 495 | 415 | 655 |
| L360/X52 | 360 | 530 | 460 | 760 |
| L415/X60 | 415 | 565 | 520 | 760 |
| L450/X65 | 450 | 600 | 535 | 760 |
OD Tolerance
| Outside diameter ,D(mm) | Tolerances(mm) | |
| Pipe except the end | Pipe end | |
| <60.3 | -0.8 to +0.4 | -0.8 to +0.4 |
| ≥60.3 to 168.3 | ±0.0075D | -0.4 to +1.6 |
| >168.3 to 610 | ±0.0075D,but maximum of ±3.2 | ±0.005D,but maximum of ±1.6 |
| >610 to 1422 | ±0.005D,but maximum of ±4.0 | ±1.6 |
| >1422 | as agreeed | |
| The pipe end incloudes a length of 100mm at each of the pipe extremities. | ||
WT Tolerance
| Wall thickness,t(mm) | Tolerances(mm) |
| ≤5 | ±0.5 |
| >5 to <15 | ±0.1t |
| ≥15 | ±1.5 |
LSAW Pipes Manufacturing Process
External corrosion process
