65Mn GB 3525-1983 Cold pressed steel wire

65Mn cold-pressed steel wire, also known as 65Mn spring steel wire, is a commonly used metal material with good mechanical properties and a wide range of applications.

Material designation	65Mn
Correspondence standard	GB 3525-1983 Cold-rolled spring and steel strips
Sort out	Carbon steel
property	Flexible and easy machinability hardenability
tag	Spring steel
Instructions	The chemical composition of this grade shall comply with the provisions of GB/T 1222-1975. 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. This standard is applicable to cold rolled steel strips of spring steel and tool steel. For the manufacture of spring, cutting tools, tape and other products ② Classification and code: - According to manufacturing accuracy: P= ordinary precision steel strip; K= steel strip with high width accuracy; H= steel strip with high thickness accuracy; J= steel strip with high thickness accuracy; KH= Steel strip with high accuracy in width and thickness - Divided by surface quality: Ⅰ=Ⅰ group steel strip; Ⅱ= Group Ⅱ steel strip - Divided by edge state: Q= cut edge steel strip; BQ= untrimmed steel strip - Divided by material status: Y= chilled steel strip; T= annealed steel strip; QT= spheroidized annealed steel strip

Market conditions

At present, there are a number of suppliers on the market to provide 65Mn cold pressed steel wire, the price varies depending on the supplier, specifications and quantity and other factors. Generally speaking, the price of 65Mn cold-pressed steel wire is relatively stable, but the specific price still needs to be determined according to market supply and demand.

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

65Mn cold-pressed steel wire is widely used in many fields because of its excellent performance:

Mechanical manufacturing: Used to manufacture a variety of small cross section of flat, round springs, plate springs and spring pieces, such as pressure regulation spring, force spring, general mechanical circular coil spring or drawn steel wire for small mechanical springs.

Transportation: In cars, trams, trains and other transportation vehicles, used in the manufacture of spring rings, valve springs, clutch reed, brake springs and other key components.

Other fields: Also used in the production of spring clips, precision machine tool screw, cutter, spiral roller bearings on the sleeve ring and other high wear resistance parts, as well as in the manufacture of instruments, furniture and children's toys.

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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