65Mn GB /T 1222-2016 Spring steels wire

65Mn GB /T 1222-2016 Spring steels wire is mainly composed of carbon (C), manganese (Mn) and other alloying elements, of which the carbon content is about 0.62%, the manganese content is adjusted according to specific needs. In addition, it also contains a small amount of silicon, phosphorus, sulfur and other elements, and its chemical composition should comply with the provisions of GB/T 13013-91 (or similar updated standards).

Material designation	65Mn
China ISC	U21653
Correspondence standard	GB /T 1222-2016 Spring steels
Brand/Supply source	China -> Henan
Sort out	Spring steel
Property	Flexible and easy machinability hardenability
Tag	High quality carbon structural steel
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.
Density	7.18 g/cm3

Physical properties:

Strength and hardness: 65Mn spring steel wire has high strength and hardness, and can withstand large loads and deformation.

Elasticity and toughness: The material also has good elasticity and toughness, and can quickly return to the original shape after external force, while not easy to break.

Wear resistance and corrosion resistance: 65Mn spring steel wire has excellent wear resistance and corrosion resistance, and can maintain stable performance in harsh environments.

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	0.03	0.03	0.25	0.35	0.25

Production process:

The production process of 65Mn spring steel wire includes raw material preparation, smelting, rolling, heat treatment, drawing and surface treatment. Among them, heat treatment is one of the key steps, through quenching and tempering treatment can improve the strength and toughness of the steel wire. Specifically, the quenching temperature is usually 830±10℃, and the oil is cooled; The tempering temperature is 540℃±10℃, and the water or oil is cooled.

65Mn mechanical properties

Heat treatment/delivery status	Tensile strength σb Mpa	Yield point σs Mpa	Elongation or elongation after breaking δ %	Shrinkage of section ψ %	Hardness HBW
Quenching and tempering	≥980	≥785	≥8	≥30	-
Hot rolling (WHR)	-	-	-	-	≤302

① The mechanical properties in the table are applicable to bars with a diameter or side length not greater than 80mm and flat steel with a thickness not greater than 40mm. For bars with diameter or side length greater than 80mm and flat steel with thickness greater than 40mm, the elongation and section shrinkage after fracture are allowed to be reduced by 1% (absolute value) and 5% (absolute value), respectively, compared with the provisions in the table.

② The mechanical properties of the rod are usually not tested. If the demander requires to test the mechanical properties, the specific indicators shall be determined by the demander and the demander through negotiation

Application field

Because 65Mn spring wire has excellent physical properties and processing properties, it is widely used in the manufacture of various springs, such as automotive suspension springs, industrial machinery support springs and shock absorbing springs. In addition, it can also be used to manufacture high wear resistance parts, such as grinding machine spindles, spring clips, precision machine tool leads, etc.

Examples of machined fastener products

65Mn（GB 1222/4358/3525；YB 5058加工的部分产品
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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