12SiMoVNb A66112 - GB 6479-2000

Grade	12SiMoVNb
China ISC	A66112
Corresponding Standard	GB 6479-2000 Seamless Steel Tubes for High-Pressure Chemical Fertilizer Equipments
Classification	Alloy Steel

12SiMoVNb Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr ^①	Ni ^①	Cu ^①	Mo	V	Nb
Minimum Value	0.08	0.5	0.6	-	-	-	-	-	0.9	0.3	0.04
Maximum Value	0.14	0.8	0.9	0.03	0.03	0.3	0.3	0.2	1.1	0.5	0.08

12SiMoVNb Mechanical Properties

Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Impact Energy Absorption KV2 J
Normalizing + tempering	≥470	≥315	≥19	≥50	KU2 ≥47

• 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: 980°C to 910 °C for normalizing, 710°C to 750°C for tempering.

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

1	GB 6479-2013
	12SiMoVNb A66112
2	GB 6479-2000
	12SiMoVNb A66112

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!