ASME SA 387 GRADE 12 Class 1 steel

ASME SA 387 Grade 12 Class 1 is a specification for low-alloy chromium-molybdenum steel plates used in the fabrication of pressure vessels and boilers. The "SA" in SA 387 stands for "Specification for ASME (American Society of Mechanical Engineers) A/SA-387."This steel grade contains chromium and molybdenum, which increases its strength and corrosion resistance. Class 1 refers to the type of heat treatment used during manufacturing, which involves normalization and tempering.

ASME SA 387 Grade 12 Class 1 steel is primarily used in high-temperature and high-pressure service applications, such as in the petrochemical and power generation industries. It is also used in the fabrication of boilers, pressure vessels, and heat exchangers.The specification sets standards for chemical composition, mechanical properties, and other important parameters to ensure that the steel plates produced according to this specification are of high quality and meet the required standards. The use of this specification provides assurance that the plates will be able to perform under extreme conditions, providing a high degree of reliability and safety.

Equivalents

BS	EN	ASTM/ASME	DIN
620 B	13 CRMO 45	SA387-12-1	13 CRMO 44

Specifications for ASME SA387 Grade 12 Alloy Steel Plates
Chromium & Molybdenum content (according to the ASME specification)

Designation	Nominal Chromium Content (%)	Nominal Molybdenum Content (%)
SA387 Grade 12	1.00%	0.50%

Tensile Requirements for ASME SA387 Grade 12 Alloy Steel Plates Class 1 Plates

Designation:	Requirement:	Grade 12
SA387 Grade 12	Tensile strength, ksi [MPA]	65 to 85 [450 to 585]
	Yield strength, min, ksi [MPa]/(0.2% offset)	40 [275]
	Elongation in 8 in. [200mm], min %	19
	Elongation in 2 in. [50mm], min, %	22
	Reduction of area, min %	–––

Chemical Requirements for ASME SA387 Grade 12 Alloy Steel Plates

Element		Chemical Composition (%)
		ASME SA387 Grade 12
Carbon:	Heat Analysis:	0.05 - 0.17
	Product Analysis:	0.04 - 0.17
Manganese:	Heat Analysis:	0.40 - 0.65
	Product Analysis:	0.35 - 0.73
Phosphorus:	Heat Analysis:	0.035
	Product Analysis:	0.035
Sulphur (max):	Heat Analysis:	0.035
	Product Analysis:	0.035
Silicon:	Heat Analysis:	0.15 - 0.40
	Product Analysis:	0.13 - 0.45
Chromium:	Heat Analysis:	0.80 - 1.15
	Product Analysis:	0.74 - 1.21
Molybdenum:	Heat Analysis:	0.45 - 0.60
	Product Analysis:	0.40 - 0.65