SA737MGrB low-alloy high-strength plate steel for pressure vessels
SA737MGrB steel plate belongs to the low alloy high-strength plate for pressure vessels, SA737 steel plate has two grades, namely SA737MGrB and SA737MGrC, the minimum yield strength of grade B is 345Mpa, and the minimum yield strength of grade C is 415Mpa.
| Chemical composition |
| Tabulation: Depu Steel Date: 2024-01-18 |
| C |
Mn |
P |
S |
Si |
V |
Nb |
N |
| 0.2-0.22 |
1.15-1.50 |
≤0.035 |
0.035 |
0.15-0.50 |
0.04-0.11 |
≤0.05 |
≤0.03 |
Note:
(1): In order to improve the properties of steel, other trace alloying elements other than the above table can be added, and the data comes from the network and is for reference only.
(2): The allowable deviation of the chemical composition of the finished steel plate shall conform to the provisions of
GB/T222 SA737MGrB alloy structural steel mechanical properties: tensile strength σb (MPa): 485-620
yield strength σs (MPa): 345 elongation δ5
(%):
18-23
Production process of SA737MGrB/C steel plate: 1. The smelting process of steel is:
open-hearth, oxygen flounder or electric furnace. The steel should be calm steel and meet the requirements of fine austenite grain size in the A20/A20M standard.
2. The material is heated to an appropriate temperature for normalizing to form an austenite structure, but the temperature should not exceed 925, and it should be kept at this temperature for enough time to make the whole material evenly heated, and then cooled in the air.
3. If the party agrees, in order to improve the strength or toughness, the cooling rate is allowed to be faster than air cooling, but then the steel plate must be tempered in the range of 95-705.
SA737MGrB steel plate and SA737MGrC steel plate Wuyang Steel Mill production, according to their own needs to choose different delivery status, can also be attached to the flaw detection standard requirements, flaw detection grade requirements, Z-direction performance requirements, add special alloying elements requirements, etc., but need to be agreed by both suppliers and demanders, and indicated in the contract
