4Cr9Si2

4Cr9Si2 Stainless Steels to GB/T 1221 (1992)

4Cr9Si2 - Specification & Application

• GB/T 1221 (1992) - Heat-resisting steel bars
• GB/T 12773 (1991) - Valve steel bars for internal combustion engines - Technical requirements
• JB/T 6398 (2006) - Heavy stainless acid resistant and heat resistant steel forgings

Valve steel bars for internal combustion engines - Technical requirements

Chemical composition(wt.%) of 4Cr9Si2 grade: to GB/T 1221 (1992)

4Cr9Si2 - Detail

4Cr9Si2

Mechanical properties of grade 4Cr9Si2 GB/T 1221 (1992)

Proof strength Rp0.2 (MPa)	Tensile strength Rm (MPa)	Impact energy KV (J)	Elongation at fracture A (%)	Reduction in cross section on fracture Z (%)	As-Heat-Treated Condition	Brinell hardness (HBW)
676 (≥)	971 (≥)	21	33	34	Solution and Aging, Annealing, Ausaging, Q+T,etc	323

Physical properties of grade 4Cr9Si2 GB/T 1221 (1992)

Property	Density kg/dm3	Temperature T °C/F	Specific heat J / kgK	Thermal conductivity W/mK	Electric resistance µΩ·cm	Modulus of elasticity kN/mm2	Expansion rate
378 (≥)	617 (≥)	22	33	32	Solution and Aging, Annealing, Ausaging, Q+T,etc	231
Temp. °C/°F	Creep strain limit (10000h) (Rp1,0) N/mm2	Creep rupture strength (10000h) (Rp1,0) N/mm2
766	365	754