Scope:
Is widely used cold die steel, high strength, good hardenability and good wear resistance, but poor impact toughness. Mainly used for shock loading less demanding wear Die and punch, cold-cut scissors, drill sets, gauge, drawing dies, pressure die, thread rolling board, thread rolling and drawing die molds.
Features:
● pure steel vacuum degassing refining process.
● ball softening annealing treatment, a good cutting performance.
● strengthen the elements vanadium, molybdenum special by adding, extremely excellent wear resistance.
Uses:
● thin plate thickness is less than 2MM, efficient blanking die, punching die and pressure die set.
● a variety of scissors, inlaid blade, woodworking blade.
● thread rolling die and wear slider.
● cold heading dies, thermosetting resin molding.
● deep drawing molding, extrusion dies.
Physical properties
Chemical Composition: (%)
Carbon C: 2.00 ~ 2.30
Si Si: ≤ 0.40
Manganese Mn: ≤ 0.40
Sulfur S: ≤ 0.030
Phosphorus P: ≤ 0.030
Chromium Cr: 11.50 ~ 13.00
Ni: to allow the residual content of ≤ 0.25
Copper Cu: to allow the residual content of ≤ 0.30
Cobalt Co: ≤ 1.00
Mechanical properties:
Hardness: Annealed, 269 ~ 217HB, indentation diameter of 3.7 ~ 4.1mm; quenching, ≥ 60HRC
Heat treatment specifications:
Heat treatment specifications: 1) quenching, 950 ~ 1000 ℃ oil cooling; 2) quenching 980 ℃, oil cooling, 180 ℃ tempering 2h.
Microstructure: martensite + carbide + retained austenite undissolved.
● Delivery status: the status of delivery of steel to annealing.
Cr12 quenching temperature
950 ~ 1000 ℃ Cr12 quenching oil quenching, tempering 550 ℃ secondary
Quench 1100-1150 ℃, low temperature quenching 960-1050 ℃, tempering 550-650 ℃, the former a secondary hardening, tempering at least 2 times 2h, after tempering the cold air or oil, high temperature for 2 times before quenching the best warm-up, when heated at high temperatures, the need to take protective measures to oxidation.

Cr12 tempering:

Recommended standard tempering steel Cr12