GH4751 751 - GB /T 12773-2021 - H2ABC

中文版

Grade	GH4751
Other Names
Corresponding Standard	GB /T 12773-2021 Valve Steel and Superalloy Bars for Internal Combustion Engines
Classification	Nickel and Nickel Alloys

GH4751 Chemical Element Composition Content (%)

Component	Fe	C	Si	Mn	P	S	Cr	Mo	Ti	Nb	Al	More
Minimum Value	5	0.03	-	-	-	-	14	-	2	0.7	0.9	Ni:余量
Maximum Value	9	0.1	0.5	0.5	0.015	0.015	17	0.5	2.6	1.2	1.5	Ni:余量

GH4751 Mechanical Properties

condition	Test Temperature	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW
Sample d=25	Room Temperature	1100~1150°C Solution treatment + 840°C×24h Air cooling + 700°C×2h Air cooling	≥1100	Rp0.2 ≥750	≥12	≥20	≥32HRC
Bar or Coil	Room Temperature	Solution treatment					≤325
sample		Solution treatment + Aging	High temperature short-term tensile strength 1000	High temperature short-term yield strength 725
sample		Solution treatment + Aging	High temperature short-term tensile strength 980	High temperature short-term yield strength 710
sample		Solution treatment + Aging	High temperature short-term tensile strength 930	High temperature short-term yield strength 690
sample		Solution treatment + Aging	High temperature short-term tensile strength 850	High temperature short-term yield strength 660
sample		Solution treatment + Aging	High temperature short-term tensile strength 770	High temperature short-term yield strength 650
sample		Solution treatment + Aging	High temperature short-term tensile strength 650	High temperature short-term yield strength 560
sample		Solution treatment + Aging	High temperature short-term tensile strength 510	High temperature short-term yield strength 425

Approximate Comparison Table Deformed High-Temperature Alloy

China	United States	International Organization for Standardization
GB	SAE	ISO
GH4751 751①	HEV3	NiCr15Fe7TiAl

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