Introduction of 65Mn chemical composition, mechanical properties and main uses Aluminum Formwork,Wall Aluminum Formwork,Wall Construction Aluminum Formwork Hebei Giant Metal Technology Co., Ltd. , https://www.358fencing.com
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65Mn:
Manganese improves hardenability. It can be hardened in steel oil of φ12mm. The surface decarburization tends to be smaller than that of silicon steel. The comprehensive mechanical properties after heat treatment are better than carbon steel, but it has overheat sensitivity and temper brittleness. Used as a small size flat, round spring, seat spring, spring spring, spring ring, valve spring, clutch reed, brake spring and cold drawn steel coiled coil spring.
Excellent overall properties, such as mechanical properties (especially elastic limit, strength limit, yield ratio), anti-ballistic properties (ie, anti-elasticity, also known as anti-relaxation), fatigue properties, hardenability, physical chemistry Performance (heat resistance, low temperature resistance, oxidation resistance, corrosion resistance, etc.). In order to meet the above performance requirements, spring steel has excellent metallurgical quality (high purity and uniformity), good surface quality (strict control of surface defects and decarburization), precise shape and size.
Use 65Mn steel plate has higher strength, hardness, elasticity and hardenability than steel No. 65. It has a tendency of overheating sensitivity and temper brittleness, and water quenching tends to form cracks. The annealed formability is acceptable, the cold deformation plasticity is low, and the weldability is poor. Medium-loaded leaf springs, coil springs up to 7-20 mm in diameter and spring washers. Spring rings. Highly wear resistant parts such as grinding machine spindles and spring chucks. Precision machine tool screw. Cut the knife. The collar on the spiral roller bearing. Railway rails, etc.
Chemical composition carbon C: 0.62~0.70
Silicon Si: 0.17~0.37
Manganese Mn: 0.90 to 1.20
Sulfur S: ≤0.035
Phosphorus P :≤0.035
Chromium Cr: ≤ 0.25
Nickel Ni: ≤0.30
Copper Cu: ≤ 0.25
Mechanical properties tensile strength σb (MPa): ≥ 980 (100)
Yield strength σs (MPa): ≥ 784 (80)
Elongation δ10 (%): ≥8
Area shrinkage ψ (%): ≥ 30
Hardness: hot rolling, ≤302HB; cold drawing + heat treatment, ≤321HB
Heat treatment quenching 830 ° C ± 20 ° C, oil cooling; tempering 540 ° C ± 50 ° C (specially required, ± 30 ° C).
In the delivery state, the hot-rolled steel is delivered in a heat-treated or non-heat-treated state, and the cold-drawn steel is delivered in a heat-treated state. 
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