In terms of performance, the cold hard coil directly obtained from
hot rolled coil through cold rolling process, process hardening
occurs during the cold rolling process, so that the yield strength
and internal stress residual part increases, and it looks “hard”
from the outside, so it is called cold hard coil. Generally
speaking, the default delivery condition of cold rolled coil is
annealed. Nowadays, most steel is sold in coils. After a company
purchases a coil, it needs to be uncoiled before it can be
processed. Generally speaking, it is used more in the automotive
industry. Of course, many automotive industries outsource the
uncoiling process and the plants use the uncoiled sheets directly.
1. Advantages:
| 1. Reasonable price with excellent quality |
| 2. Abundant stock and prompt delivery |
| 3. Rich supply and export experience, sincere service |
2. Material:
A36, A53, ASTM A106, JIS S400, Q235B, Q235C, Q235D, Q345E, Q345,
Q390B, Q390C, Q390D, Q390E, Q420, Q420B, Q420C, Q420D, Q420E, Q460,
Q460D, Q500C, Q500D, Q550C, Q550D, Q550E, Q620C, Q620D, Q620E,
Q690A, Q690B, Q690C, Q690D, Q690E, Q690D, Q690C, Q890C, Q890D,
16Mo3, 16MnL, 16MnR , 16Mng, 16MnDR
3. Chemical Composition:
| Grade | Rank | Chemical Composition( %) |
| C | Mn | Si | S | P |
| Q215 | A | 0.09~0.15 | 0.25~0.55 | ≤0.3 | ≤0.05 | ≤0.045 |
| B | ≤0.045 |
| Q235 | A | 0.14~0.22 | 0.30~0.65 | ≤0.3 | ≤0.05 | ≤0.045 |
| B | 0.12~0.20 | 0.30~0.70 | ≤0.045 |
| C | ≤0.18 | 0.35~0.80 | - | ≤0.04 | ≤0.04 |
| D | ≤0.17 | ≤0.035 | ≤0.035 |
| Q255 | A | 0.18~0.28 | 0.40~0.70 | ≤0.3 | ≤0.05 | ≤0.045 |
| B | ≤0.045 | |
| Q275 | | 0.28~0.38 | 0.50~0.80 | ≤0.35 | ≤0.05 | ≤0.045 |
4. Standard:
| Standard | Grade | General Size | Delivery Condition |
| ASTM A36 | A36/A36-B | 5-20 * 2300-2500 * C | Boron added or Black Condition |
| ASTM A283 | A283-B/A283C | 5-20 * 2300-2500 * C | Boron added or Black Condition |
| ASTM A572 | A572Gr50-B/A572Gr42-B | 5-20 * 2300-2500 * C | Boron added or Black Condition |
| ASTM A515 | A515Gr70 | 5-20 * 2300-2500 * C | Boron added or Black Condition |
| ASTM A516 | A516Gr70 | 5-20 * 2300-2500 * C | Boron added or Black Condition |
| JIS G 3101 | SS400-B | 5-20 * 2300-2500 * C | Boron added or Black Condition |
| JIS G3136 | SN400B | 5-20 * 2300-2500 * C | Boron added or Black Condition |
| EN10025-2:2004 | S235JR-S355K2+N | 5-20 * 2300-2500 * C | Boron added or Black Condition |
| EN10025-5:2004 | S355J2W/S355K2W | 5-20 * 2300-2500 * C | Boron added or Black Condition |
5. Packing:
Standard stainless steel shipping packaging or as customer
required.
