Feature
The upsetting of steel suitable for manufacturing, and other hot die forging presses, die life is higher.
Use
● 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
C Si Μn Cr Mo W V P S
0.32 ~ 0.42 0.60 ~ 0.90 ≤ 0.65 2.80 ~ 3.30 2.50 ~ 3.00 1.20 ~ 1.80 0.80 ~ 1.20 ≤ 0.03 ≤ 0.03

Mechanical properties
Critical point Ac1 Ac3 Ar1 Ar3 Ms
Temperature (approximate) / ℃ 850 930 735 825 400

Table 3-10-3 3Cr3Mo3W2V steel wire (swelling) expansion coefficient
Temperature / ℃ 25 ~ 100 25 ~ 200 25 ~ 300 25 ~ 400 25 ~ 500 25 ~ 600 25 ~ 700
Line (swelling) expansion coefficient / ℃ 10.4 × 10 12 × 10 11.06 × 10 12.27 × 10 12.53 × 10 13.35 × 10 13.58 × 10

Table 3-10-4 3Cr3Mo3W2V thermal conductivity of steel
Temperature / ℃ 99.4 398.2 479.4 568 673.4
Thermal conductivity λ / W · (m · K) 31.8 30.9 31.8 31.8 31.8
Item heating temperature / ℃ open forging temperature / ℃ final forging temperature / ℃ Cooling
Ingot
Billet 1170 - 1200
1150 ~ 1180 1100 ~ 1150
1050 ~ 1100 ≥ 900
≥ 850 slow cooling (or pit sand cold cold)
Slow cooling (or pit sand cold cold)

 
Heat treatment process
● Delivery status: the status of delivery of steel to annealing.
Blacksmithing: oil quenching cold cracking susceptibility of some tool steel, forging heating should not be rapidly heated, preferably 650-750 degrees for a warm-up, forging heating temperature of 1130-1150 degrees, the final forging temperature should be greater than 800 - 850 degrees, take the upper ingot forging temperature. Lower temperature when you get the blank forging
Annealing:
Annealing generally used 780-800 degrees, heat 4-6 hours to ≤ 50 degrees / hour, cooled to 550 degrees baked cooled, isothermal annealing using 700-800 degree heat 2-4 sales, then 670-720 degree heat, to maintain 2-4 hours to ≤ 50 ° / hr cooling rate, cooling to 500 degrees baked cooled, annealed hardness of 241-197H