65Mn GB /T 1222-2007 spring wire manufacturers

65Mn spring steel wire is mainly composed of carbon (C), manganese (Mn) and other alloying elements, of which the carbon content is about 0.65%, and the manganese content is adjusted according to specific needs. This ratio makes 65Mn spring steel wire have high strength and hardness, as well as good toughness and elasticity.

Material designation	65Mn
China ISC	U21653
Correspondence standard	GB /T 1222-2007 Spring Steels
Sort out	Carbon steel
Property	Strength elastic resistance to fatigue
Tag	High quality carbon structural steel fastener material
Instructions	• High strength, good hardenability and comprehensive mechanical properties, small decarburization tendency, but with overheating sensitivity and tempering brittleness, easy to appear quenching cracks. • 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. • In the fastener industry, the standard GB/T 94.1 refers to the standard this grade can be used for the production of national standard GB93 spring pad (for the production of ladder steel wire specifications see standard GB 5222), performance: quenching and tempering 40~50HRC or 392~513HV, the surface of the spring pad needs oxidation and phosphating; After galvanized, the spring pad must be treated with hydrogen displacement immediately. • This standard applies to spring round steel and square steel (referred to as bar) with a diameter or side length not greater than 100mm, spring flat steel with a thickness not greater than 40mm, spring steel wire with a diameter not greater than 25mm (excluding oil quenched and tempered spring wire wire wire (YB/T 5365)). Rods with diameters or side lengths greater than 100mm, flat steel with thicknesses greater than 40mm and rods with diameters greater than 25mm can also be supplied after negotiation between the supply and demand parties. • The grades and chemical compositions specified in this standard also apply to ingot, billet and its products.

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65Mn Chemical element content (%)

Ingredient	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

The production process of 65Mn spring steel wire includes many links such as raw material preparation, smelting, rolling, heat treatment, drawing and surface treatment. By precisely controlling each production step, we can ensure that the quality and performance of the final product meet the standard requirements.

Examples of machined fastener products

65Mn/U21653 (Part of GB/T 1222,5222 processed products)
name	Model number	Performance class	specification
Spring washer	GB 93-1987	Tempered, ≥34HRC or 336HV	-
Elastic retainer for hole	GB/T 893-2017	Heat treatment, 40~54HRC	-
Elastic retainer for shaft	GB/T 894-2017	Heat treatment, 40~54HRC	-
Open elastic retainer	GB/T 896-2020	Heat treatment, 40~54HRC	-
Internal/external tooth lock washer	GB 861.1/862.1-1987	Quench and temper, HRC 40~50	-
Inner/outer serrated lock washer	GB 861.2/862.2-1987	Quench and temper, HRC 40~50	-
Taper lock washer with outer teeth	GB 956.1-1987	Quench and temper, HRC 40~50	-
Tapered serrated lock washer	GB 956.2-1987	Quench and temper, HRC 40~50	-
Saddle shaped elastic washer	GB 860-1987	Quench and temper, HRC 40~50	-
Corrugated elastic washer	GB 955-1987	Quench and temper, HRC 40~50	-

Note 1: Spring washer (trapezoidal spring wire specification for spring washer see standard GB/T 5222) refer to standard GB/T 94.1-2008. Hole, shaft and open ring reference standard GB/T 959.1-2017.

Note 2: Tooth washer reference standard GB/T 94.2-87; Saddle and corrugated elastic washers refer to GB/T 94.3-2008

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