Stock management of rolling bearings
Stock management of rolling bearings
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The stainless steel forging defects caused by improper heat
by：Waxing
2020-09-30
1 heating caused by improper defects.
Coarse grains with heterogeneous change, iron element size stainless steel without heating the grain growth tendency.
And grain size is too large, can cause large brittleness, reduce the impact toughness of steel.
Therefore, the heating temperature is unfavorable and exorbitant, high temperature retention time shoulds not be too long.
2.
Increase the delta ferrite austenite dual phase steel and martensitic steel heated to high temperatures, can appear too much delta ferrite, results in the decrease of the technology of plastic alloy, causing forging cracking.
1 cr12ni2w2mov steel for forging heating temperature is exorbitant, the delta facies precipitation caused by number of forging cracking.
3.
Low melting point compound to form a high percentage of nickel stainless steel application does not contain sulfur gas heating, because the sulfur infiltration in steel with nickel formation of low melting point NiS or Ni + Ni3S2 eutectic, the sulfide and eutectic distribution on the grain boundary, when forging are prone to intergranular crack.
Apart from the above heating defects, martensite stainless steel also should use slow uniform heating, because of the chromium content is higher in martensitic steel, chromium and pearlite transformation temperature of steel, reducing the speed of austenite decomposition and reduce the thermal conductivity of steel, which caused the temperature stress of organizational stress, billet caused by cracking.
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