Product Parameter

7CrSiMnMoV has the characteristics of low alloy flame quenching cold work die steel, with the core advantages of "flame quenching + toughness and wear resistance + economy and high efficiency", which is an ideal material for on-site repair of large dies and simple die manufacturing.

Smelting Method

Core process: adopting electrostatic remelting (ESR) refining process;

Through ESR deep purification, the contents of sulfur, phosphorus and non-metallic inclusions are significantly reduced, and the microstructure uniformity is improved.

The vacuum degassing technology is used to control the oxygen content (≤ 20 ppm) to prevent the white spot defect;

Process Characteristics

Heat treatment process

Forging process

Multi-direction upsetting and drawing (forging ratio ≥ 7), initial forging temperature 1100 ~ 1150 ℃, final forging temperature ≥ 850 ℃, avoiding carbide segregation;

Purity

Impurity control: S ≤ 0.030%, P ≤ 0.030%;

After ESR optimization: non-metallic inclusions A/B/C ≤ Grade 1.5 (ASTM E45 standard);

Micro-Structure

Quenched state: lath martensite matrix (wide lath at grain boundary + thin lath in grain) + a small amount of twin martensite; The dispersed carbides (Cr7C₃、Mo₂C) are evenly distributed.

Tempered state: tempered martensite structure, grain size ≥ ASTM 8;

Impact Work

Conventional process: impact energy at room temperature ≥ 50 J (matrix hardness HRC 40 ~ 45);

Optimized process: impact toughness ≥ 150 J/cm ² (hardness 60 ~ 63 HRC) after nitrate quenching and tempering;

Ultrasonic Flaw Detection

Industry standard: SEP 1921/ASTM A388; Grade: high quality grade: defect ≤ Φ1 mm equivalent (for precision parts):

Ex-Factory Status

Annealed state: hardness ≤ 229 ~ 241 HB (smooth round/black fur round);

Size Specification

Product Main Features

Flame quenching characteristics: local acetylene flame heating air quenching (≥ 58 HRC), no overall heat treatment, deformation risk reduction of 90%;

Balance of strength and toughness: bending strength ≥ 4100 MPa, compressive strength ≥ 5300 MPa, superior to Cr12MoV4;

Wear resistance and economy: wear resistance is superior to T10a and 9Mn2V, and the cost is 2/3 lower than that of imported steel;

Machining friendliness: the cutting performance in the annealed state is similar to that of 45 steel, and the flame quenching area needs to be machined by CBN tools;

Product Application Area

Packing and Shipping

Generally, packing and transportation will be arranged according to the customer's requirements, whether to pack and arrange the appropriate mode of transportation, vehicles, such as whether to directly load and transport, whether to pack steel belts, whether to pack and spray marks, etc.

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