Preparation method of mold steel for excavator track

Preparation method of mold steel for excavator track

  • CN 105,483,503 A
  • Filed: 12/04/2015
  • Published: 04/13/2016
  • Est. Priority Date: 12/04/2015
  • Status: Active Application
First Claim
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1. crawler of excavator die steel preparation method, is characterized in that, includes following processing step:

  • A, prepare die steel molten iron, in this molten iron, each alloying constituent weight percentage is;

    C2.28 ~ 2.65, Mn0.15 ~ 0.25, Si0.45 ~ 0.65, Cr1.15-1.25, Ni0.25 ~ 0.55, Pb0.025 ~ 0.045, Sn0.04 ~ 0.06, V0.08 ~ 0.12,0.015≤

    P≤

    0.025,0.015≤

    S≤

    0.035, and surplus is iron;

    Adopt chilling technology in casting process, the temperature head between molten steel pouring temperature and metal die is at 1250-1300 DEG C;

    C, casting die steel heat 2-2.5 hour at 560-600 DEG C, and then be warming up to 950-1000 DEG C in 50-60 minute, keep 30-40 minute heat-up time, quench with quenching oil, again the casting die steel after quenching is carried out tempering 40-50 minute at 500-530 DEG C, then taking-up puts into the tempering oil of 180-200 DEG C with oily slow cooling from tempering stove;

    Temperature put into by casting die steel after d, tempering is that the bonderizing solution of 60-100 DEG C floods 30-40 minute, and this bonderizing solution is made up of following raw material by weight;

    10-12 part sodium phosphate, 4-6 part cupric nitrate, 3-5 part phytic acid, 2.5-3.5 part Sodium tetrafluoroborate, 12-14 part tertiary iron phosphate, 0.3-0.6 part barium nitrite, 0.3-0.5 part trolamine, 1.5-2 initiator, 0.3-0.5 part tensio-active agent, 45-50 part water;

    Casting die steel after e, bonderizing carries out salt bath process, fully contact with body lotion, wherein salt bath treatment temp is 175-220 DEG C, soaking time is 1.5-2.5h, and each weight ratio of constituents of fused salt is;

    potassium nitrite 20-22 part, soda ash 14-16 part, sodium-chlor 12-14 part, magnesiumcarbonate 3-5 part, Quilonum Retard 4.5-5.5 part;

    F, finally carry out vacuum nitriding process, concrete technology is for after being vented to vacuum tightness 0.22-0.32Pa by vacuum oven, and in-furnace temperature is warming up to 600 ~ 620 DEG C, sends into ammonia with 1.5-1.7L/min simultaneously, send into ammonia simultaneously controling of the pressure of the oven at 0.15-0.25Pa.

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