Parameters of 65Mn manganese steel screen raw materials

Types, specifications and applications of manganese 65Mn steel screen. Manganese steel
screen is also known as manganese steel wire woven mesh, manganese steel wire mesh, manganese steel ore screen, manganese steel crimping mesh, manganese steel vibrating screen, manganese steel vibrating screen, etc.
Raw materials of manganese steel screen: manganese steel wire, high manganese steel wire, 65 manganese steel wire, 65Mn is the raw material.
Textile structure and characteristics: after first rolling and then weaving, two-way bending, two-way wave separation bending, locking bending, flat-top bending, two-way bending, one-way wave separation bending, rectangular hole weaving, the mesh has the characteristics of strong weaving, durability and uniform mesh.
Mesh number: 1 mesh - 24 mesh.
Width: 1 meter - 8 meters.
Uses: Manganese steel crimped wire mesh is widely used in mining, petroleum, chemical industry, construction, machinery accessories, protective nets, packaging nets, barbecue nets, barbecue stove nets, sintering furnace nets, hardware products nets, handicraft nets, vibrating screens, basket nets, food machinery nets, cooker nets, wall nets, grain, roads, railways, infrastructure nets, can be used as a screen for grading and screening of solid materials, for filtering liquids and mud, aquaculture, civil use, etc.

Parameters of 65Mn manganese steel mesh raw materials
Material name: spring steel
Grade: 65mnStandard
: GB/T 1222-2007
●Characteristics and application scope: After heat treatment and cold drawing hardening, it has high strength, certain toughness and plasticity; under the same surface state and complete hardening conditions, the fatigue limit is equivalent to that of alloy springs. However, the hardenability is poor, and it is mainly used for springs of smaller sizes, such as pressure and speed regulating springs, force measuring springs, round and square spiral springs on general machinery, or drawn into steel wires for springs on small machinery.

●Chemical composition:
Carbon C: 0.62~0.70
Silicon Si: 0.17~0.37
Manganese Mn: 0.90~1.20
Sulfur S: ≤0.035
Phosphorus P: ≤0.035
Chromium Cr: ≤0.25
Nickel Ni: ≤0.25
Copper Cu: ≤0.25

Mechanical properties
Tensile strength Rb (MPa): ≥980
Yield strength Rs (MPa): ≥785
Elongation δ10 (%): 14~21.5
Sectional reduction ψ (%): not less than 10

Hardness
Hot rolling hardness: 240~270HB
Cold rolling soft hardness: 190~220HB
Cold rolling hard hardness: 300~340HB
Heat treatment hardness: 38~60HRC

Heat treatment
Heat treatment and specifications
Quenching 830℃±20℃, oil cooling; Tempering 540℃±50℃ (±30℃ when special needs).
Critical point temperature (approximate value) Ac1=726℃, Ac3=765℃, Ar3=741℃, Ar1=689℃, Ms=270℃.
Normalizing specification: temperature 810±10℃, air cooling.
Quenching and tempering specification: quenching temperature 830±10℃, oil cooling; tempering temperature 540℃±10℃, water and oil cooling.
Delivery status
Hot-rolled steel is delivered in heat-treated or non-heat-treated state, and cold-drawn steel is delivered in heat-treated state. (2.0-16)*1250*C Laigang/Hot Coil/Hot Plate
50Mn (2.0-16)*1250*C Laigang/Hot Coil/Hot Plate
65Mn (2.0-16)*1010/1250*C Laigang/Hot Coil/Hot Plate

Annealing Specification
Traditional periodic spheroidizing annealing process, annealing temperature 750℃, keep warm for 2h, furnace cool to temperature (680±10)℃, keep warm for 3h, then furnace cool to 550℃, then air cool out of the furnace. Low production efficiency, oxidation decarburization rate of 22%-40%, surface hardness and elasticity do not meet the requirements. New incomplete annealing process, annealing temperature (740±10)℃, keep warm for 4h, furnace cool to 550℃, then air cool out of the furnace. Tensile strength 600-620Mpa, elongation 53.5%-40%, hardness 209-214HBW metallographic structure is spheroidized pearlite + a small amount of dotted pearlite, which shortens the production cycle and saves energy.
New annealing process
Traditional annealing process, annealing temperature 730℃, insulation 13h, then furnace cooling to 650℃, out of the furnace air cooling. New annealing process: annealing temperature (860±10)℃, insulation 45-60min, furnace cooling to (750±10)℃, insulation 3-3.5h, after the furnace cools to 650-660℃, out of the furnace pile cooling or into the insulation pit slow cooling. The metallographic structure meets the requirements: pearlite structure 2.5-6 level, preferably around level 4, this process improves efficiency by 80%-100%.

Heat treatment
65Mn low alloy round steel must have high elastic limit and high yield strength ratio to avoid permanent deformation of spring steel under high load; it also requires good hardenability and low decarburization sensitivity to significantly reduce the elastic limit; as well as good surface quality, easy processing and forming in hot and cold states, and good heat treatment processability. Heat treatment process
of hot-formed spring steel for springs formed in hot state. Most spring steels formed in this way combine hot forming and heat treatment, while most spiral spring steels are heat treated after hot forming. The heat treatment method of this spring steel is quenching + medium temperature tempering, and the structure after heat treatment is tempered troostite. This structure has high elastic limit and yield limit, and has certain toughness.
Adopting new concepts and methods, innovatively developing stability control technology, carefully analyzing the formation mechanism of problems such as "rolling breakage and tail swinging" that are most likely to occur in this "0.4 second" time, and working on reducing roller damage and tail deviation, etc., after more than 3 years of software program development, tracking tests, evaluation, and analysis, reasonable process parameters are determined.
65Mn steel plate has higher strength, hardness, elasticity and hardenability than 65 steel, has overheat sensitivity and temper brittleness tendency, and has a tendency to form cracks when quenched in water. The machinability of the annealed state is acceptable, the cold deformation plasticity is low, and the weldability is poor. Plate springs with medium loads, spiral springs and spring washers with a diameter of 7-20mm. Spring rings. Highly wear-resistant parts, such as grinder spindles, spring chucks, precision machine tool screws, cutters, rings on spiral roller bearings, railway rails, etc.