ASTM AH36 VS A36, difference between A36 and AH36 steel

ASTM AH36 is under ASTM A131/A131M standard, ASTM AH36 refers to AH36 shipbuilding steel. Usually the end user has class certification requirement for ASTM AH36 shipbuilding steel. Such as ABS, LR, BV, GL DNV, RINA, NK and so on.

Sometimes, ASTM AH36 shipbuilding steel is also short to A36 shipbuilding steel. In this condition, ASTM AH36 steel and A36 steel is totally the same.

However, at most times, ASTM A36 steel means another steel type, it is A36 mild steel. A36 mild steel is for general construction, seldom used for ship building. A36 mild steel strength is lower than ASTM AH36 shipbuilding steel strength.

ASTM AH36 VS A36 mild steel in chemical composition:

ASTM AH36 VS A36 mild steel in mechanical properties:

From above tables about ASTM AH36 VS A36 mild steel in chemical composition and mechanical properties, we can easily understand that A36 mild steel is totally different from ASTM AH36 shipbuilding steel.

In order to avoid misunderstanding, it is suggested not to short ASTM AH36 steel to A36 steel. If you prefer to use A36 not AH36 for shipbuilding steel, it is better to mention ASTM A131, ABS, BV, LR, ship etc. words that can help shipbuilding steel suppliers to understand what you need is ASTM A131 A36 shipbuilding steel but not ASTM A36 mild steel.

The main shipbuilding steel grades of BBN steel are grade A, B, D, E, AH32, DH32, EH32, FH32, AH36, DH36, EH36, FH36, AH40, DH40, EH40, FH40, etc. And our cooperated classification societies are ABS, LR, BV, VL (DNV GL), RMRS, RINA, KR, NK, CCS.