65Mn YB /T 5058-2005 Spring steel wire manufacturers

65Mn spring steel wire is a commonly used spring material, after heat treatment and cold drawing hardening, the strength of 65Mn spring steel wire is significantly improved, while maintaining a certain flexibility and plasticity. In the same surface state and fully quenched case, its fatigue limit is comparable to the colorful alloy spring.

Material designation	65Mn
Correspondence standard	YB /T 5058-2005 Cold-rolled spring and tool steel strips
Sort out	Carbon steel
Property	Hardness Easy machinability hardenability
Tag	Cold rolled steel strip
Instructions	The steel is a very widely used spring steel grade, high strength, good hardenability and comprehensive mechanical properties, small decarbonization tendency, good cutting performance, and low price. However, it has overheating sensitivity and tempering brittleness, and it is easy to appear quenching crack. Poor corrosion resistance. For slightly larger ordinary springs, such as 5~10mm leaf springs and wire diameter 1~15mm coil springs, can also be used as spring rings, valve springs, spring, shock absorbers and clutch reeds, as well as cold coil springs made of drawing steel wire 65Mn is widely used in the fastener industry, can produce all kinds of spring washers, elastic cylindrical pins and some elastic rings, etc., a small amount of nuts. No bolts, screws and conventional washers. Recommended selection: All kinds of spring washers, pins and clasp, etc., working in a non-corrosive environment, strength 40~54HRC, recommended selection

65Mn spring steel wire also has excellent wear resistance, corrosion resistance and fatigue resistance, which can maintain stable performance in harsh environments. In addition, although its hardenability is relatively poor, it is suitable for the manufacture of smaller sizes of springs.

65Mn Chemical element content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum value	0.62	0.17	0.9	-	-	-	-	-
Maximum value	0.7	0.37	1.2	0.035	0.035	0.25	0.25	0.25

Production technology

The production process of 65Mn spring steel wire includes many links such as raw material preparation, smelting, rolling, heat treatment, drawing and surface treatment. Among them, heat treatment is one of the key links, through quenching and tempering process treatment, can significantly improve the mechanical properties and stability of steel wire.

65Mn mechanical properties

thickness t mm	Tensile strength σb Mpa	Elongation or elongation after breaking δ %
t≤1.5, annealed steel strip	≤635	≥20
t > 1.5, annealed steel strip	≤735	≥15
Chilled steel strip	735~1175

Examples of machined fastener products

65Mn (GB 1222/4358/3525; Some products processed by YB 5058
name	Model number	Performance class	specification
Conical lock washers for assemblies	GB 9074.28-1988	40~50HRC	5~8
Spring washers for assemblies	GB 9074.26-1988	42~50HRC	2.5~12
Tapered serrated lock washer	GB 956.2-1987	40~50HRC	3~5
Elastic retainer for shaft	GB 894.1-1986	47~54HRC	3~85
Wire retaining ring for shaft	GB 895.2-1986	-	4~35
Hole with wire ring	GB 895.1-1986	-	7~65
Elastic retainer for hole	GB 893.1/.2	47~54HRC/44~51HRC	3~200
Standard spring washer	GB 93-1987	42~50HRC	2~27
Corrugated elastic washer	GB 955-1987	40~50HRC	3~12
Saddle shaped elastic washer	GB 860-1987	-	2~8
Retaining nut	GB 805-1988	30~40HRC	6~48

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