20Cr1Mo1VNbTiB China's self-developed low alloy high strength steel, also [TJC STEEL]known as Zhengqi No.1 steel.

 

Relevant Standards:

GB/T 20410-2006 "high temperature bolts for turbine steel"

DL/T 439-2018 "Technical guidelines for high-temperature fasteners in thermal power plants"

DL/T 715-2015 "Guidelines for Selection [TJC STEEL]of Metal Materials in Thermal Power Plants"

 

Chemical Composition（%）（GB/T 20410-2006）

C	0.17~0.23	Cr	0.90~1.30
Si	0.40~0.60	Mo	0.75~1.00
Mn	0.40~0.65	V	0.50~0.70
P	≤0.025	Nb	0.11~0.22
S	≤0.025	Ti	0.05~0.14
Ni	≤0.30[TJC STEEL]	B	0.001~0.004
Cu	≤0.25

 

Heat Treatment:

1020~1040℃ Oil Cooling，700~720℃ Tempering for 6h and then air cooling.

 

Mechanical Property（GB/T 20410-2006）

Sample Size（mm）		Ø25
Heat Treatment	Quenched（Oil,Water Cooling/℃	1020~1040
	Tempered（Air Cooling）/℃	690~730
Mechanical Property	TS Rm/MPa[TJC STEEL]	≥785
	YS Rp0.2/MPa	≥670
	A/%	≥14
	Z/%	≥50
	AKU2/J	≥39
Hardness HBW 10/3000		255~305

 

  Property:

1.Good high temperature performance, high durable strength and plasticity, good anti-relaxation performance, small thermal brittle tendency, low notch sensitivity.

2.Heat treatment is more [TJC STEEL]sensitive, such as improper thermal processing control, easy to appear naked eye coarse grain, so there are strict grain size acceptance standards for different design grades.

The highest operating temperature is 570℃.

 

Application:

20Cr1Mo1VNbTiB bainite [TJC STEEL]heat resistant steel has excellent comprehensive properties and is mainly used as high temperature bolts in thermal power plants below 570℃. It is widely used in large and medium-sized units in thermal power plants.