12Cr2Mo A30132 - GB 6479-2000

Grade	12Cr2Mo
China ISC	A30132
Corresponding Standard	GB 6479-2000 Seamless Steel Tubes for High-Pressure Chemical Fertilizer Equipments
Classification	Alloy Steel

12Cr2Mo Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni ^①	Cu ^①	Mo
Minimum Value	0.08	-	0.4	-	-	2	-	-	0.9
Maximum Value	0.15	0.5	0.7	0.03	0.03	2.5	0.3	0.2	1.2

12Cr2Mo Mechanical Properties

Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Impact Energy Absorption KV2 J
Normalizing + tempering	450~600	≥280	≥20	KU2 ≥38

• When the final rolling temperature of hot-rolled pipes meets the normalizing temperature, normalizing can be used as a substitute.
• Steel pipes with an outer diameter d≥57mm and a wall thickness T≥14mm shall undergo U-notch impact tests as standard specimens. The evaluation of impact test results shall be in accordance with the provisions of GB/T 17505.
• Except for 12Cr2Mo, for other grades, when the wall thickness T is greater than 16 to 40mm, the yield point is allowed to decrease by 10MPa.

* Normalizing + tempering NT: Normalizing at 900°C to 960°C and tempering at 700°C to 750°C. It can also be heated to 900°C to 960°C first, then cooled in the furnace to 700°C, held for more than 1 hour, and air-cooled
• For steel pipes made of this grade of steel, when the outer diameter d is no more than 30mm and the wall thickness T is no more than 3mm, the yield point is allowed to be reduced by 10MPa.

Approximate Comparison Table Structural Alloy Steel

China	United States
GB	ASTM/AISI
12Cr2Mo	A335 Grade P22

12Cr2Mo Corresponding Standards(Same grade name, different standards)

1	GB 6479-2013
	12Cr2Mo A30132
2	GB 6479-2000
	12Cr2Mo A30132

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