ASTM P21

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ASTM P21

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P21 Application:Alloy tool steel

Chemical composition(mass fraction)(wt.%) of the P21
C(％) Si(％) Mn(％) P(％) S(％) Cr(％) Ni(％) V(%) Al(%)
0.18～0.22 0.20～0.40 0.20～0.40 ≤0.030 ≤0.030 0.50～0.30 3.90～4.25 0.15～0.25 1.05～1.25

Mechanical properties of grade P21

Yield
Rp0.2 (MPa)		 Tensile
Rm (MPa)		 Impact
KV (J)		 Elongation
A (%)		 Reduction in cross section on fracture
Z (%)		 As-Heat-Treated Condition HBW
459 (≥) 765 (≥) 42 11 13 Solution and Aging, Annealing, Ausaging, Q+T,etc 132

Physical properties of grade P21

Property Density
kg/dm3		 Temperature T
°C/F		 Specific heat
J / kgK		 Thermal conductivity
W/mK		 Electric resistance
µΩ·cm
194 (≥) 622 (≥) 13 44 21 Solution and Aging, Annealing, Ausaging, Q+T,etc
Temp.
°C/°F		 Creep strain limit
(10000h)
(Rp1,0) N/mm2		 Creep rupture strength
(10000h)
(Rp1,0) N/mm2		 - - -
473 411 328 - - -

P21 Range of products
Product type Products Dimension Processes Deliver Status
Plates / Sheets Plates / Sheets 0.08-200mm(T)*W*L Forging, hot rolling and cold rolling Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Steel Bar Round Bar, Flat Bar, Square Bar Φ8-1200mm*L Forging, hot rolling and cold rolling, Cast Black, Rough Turning, Shot Blasting,
Coil / Strip Steel Coil /Steel Strip 0.03-16.0x1200mm Cold-Rolled & Hot-Rolled Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Pipes / Tubes Seamless Pipes/Tubes, Welded Pipes/Tubes OD:6-219mm x WT:0.5-20.0mm Hot extrusion, Cold Drawn, Welded Annealed, Solution and Aging, Q+T, ACID-WASHED