| Standard | Grade | Delivery Conditions | |||
| BK(hard) | BKW(soft) | ||||
| Tensil Stength(Mpa) | Make percentage elongation(%) | Tensile stength(Mpa) | Make percentage elongation(%) | ||
| GB/T 3639 GB 3077 | 20# | ≥550 | ≥10 | ≥490 | ≥15 |
| 25Mn | ≥600 | ≥12 | ≥540 | ≥15 | |
| Q345B | ≥620 | ≥12 | ≥550 | ≥15 | |
| 45# | ≥645 | ≥8 | ≥625 | ≥15 | |
| 40Cr | ≥784 | ≥14 | \ | \ | |
| 37Mn5 | ≥784 | ≥14 | \ | \ | |







Q: How could you guarantee your products?
A: Each piece of products is manufactured by certified workshops, inspected by SORUN piece by piece according to national QA/QC standard. We also could issue the warranty to customer to guarantee the quality.
Q:Can you send samples?
A:Of course, we can send samples to all parts of the world, our samples are free, but customers need to bear the courier costs.
Q:What product information do I need to provide?
A:You need to provide the grade, width, thickness, coating and the number of tons you need to purchase.
Q:What are the shipping ports?
A:Under normal circumstances, we ship from Shanghai, Tianjin, Qingdao, Ningbo ports, you can choose other ports according to your needs.