XM-21 (UNS S30452)

XM-21 Austenitic Stainless Steel

UNS  S30452

Introduction & Properties

XM-21 (UNS S30452) is a kind of austenitic chrome-nickel steel that is developed by adding nitrogen and niobium on the basis of the 304/S30400. And the Nb can improve inter granular corrosion resistance while  N can significantly increase the strength of stee and reduce the thickness and weight of of the material.

Chemical Composition of XM-21 (UNS S30452) (%)
 Grade                C         Si         Mn        P         S          Cr         Ni            Nb         N
  XM-21    Min.      --        --         --          --         --       18.00      8.00       3.00       0.16
              Max.   0.08     1.00     2.50     0.045   0.03     20.00      10.0       4.00       0.30
 
Forging process of XM-21/S30452
Preheat / ℃     initial forging temperature / ℃         final forging temperature / ℃         Cooling
        815                         1150 ~ 1160                                     ≥ 930                        air-cooled
Preliminary heat treatment of XM-21/S30452
Annealing on elimination of processing stress 300 ~ 350 ℃, heat 1 ~ 2h, air cooling; Annealing on eliminating hardening stress 750 ~ 850 ℃, heat 1 ~ 3h, fast-cooling.
 
Stabilization of solution of XM-21/S30452
Solution heat treatment: heating temperature 1010 ~ 1150 ℃, rapid cooling, the hardness ≤ 250HBW;
Stabilization treatment: heating temperature 850 ~ 900 ℃, heat 2h, air cooling.

Application

XM-21 (UNS S30452) can be used on the equipment and structures with the requirements of high strength and resistance to intergranular corrosion.


Please contact our company service (hotline:86 0510-83,632,628) to get more information on selection, application, heat treatment and inventory and other related information about XM-21 (UNS S30452), you can also contact us for more information about austenitic stainless steel and  stainless steel.



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