DIN	W-Nr	AISI/SAE	ASTM	API
St 37.0			A-53 Gr.B	5L-Gr B
St 52.3	1.0570	1024	A-252 Gr.3	5L- Gr. X52

Structural Steel standards for valves

ASTM A516 / A516M - 10
Standard Specification for Pressure Vessel Plates, Carbon Steel, for Moderate- and Lower-Temperature Service
This specification covers carbon steel plates intended primarily for service in welded pressure vessels where improved notch toughness is important. According to different strength levels, the plates are available in four grades: Grades 55, 60, 65, and 70. The maximum thickness of plates is limited only by the capacity of the composition to meet the specified mechanical property requirements. The steel shall be killed and shall conform to fine austenitic grain size requirements. The mechanical properties such as tensile strength, yield strength, and elongation shall be determined by a tension test for the plates.

DIN 17121-84
Seamless circular steel tubes for structural steel work