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El721Application:Spain structural alloy steel
CategoryTypeSteel gradeStandardCountry
Grades Special Alloy El721UNESpain

Chemical composition%of the ladle analysis of gradeEl721

C(%)Si(%)Mn(%)P(%)S(%)Cr(%)Mo(%)
0.28-0.350.15-0.400.40-0.700.0350.0352.30-2.800.30-0.50
El721
Mechanical properties of gradeEl721
Proof strength
Rp0.2(MPa)
Tensile strength
Rm(MPa)
Impact energy
KV(J)
Elongation at fracture
A(%)
Reduction in cross section on fracture
Z(%)
As-Heat-Treated ConditionBrinell hardness(HBW)
734(≥)997(≥)224442Solution and Aging,Annealing,Ausaging,Q+T,etc323
Physical properties of gradeEl721
PropertyDensity
kg/dm3
Temperature T
°C/F
Specific heat
J/kgK
Thermal conductivity
W/mK
Electric resistance
µΩ·cm
Modulus of elasticity
kN/mm2
Expansion rate
579(≥)767(≥)213441Solution and Aging,Annealing,Ausaging,Q+T,etc111
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0)N/mm2
Creep rupture strength
(10000h)
(Rp1,0)N/mm2
885727352
El721Range of products
Product typeProductsDimensionProcessesDeliver Status
Plates/SheetsPlates/Sheets0.08-200mm(T)*W*LForging,hot rolling and cold rollingAnnealed,Solution and Aging,Q+T,ACID-WASHED,Shot Blasting
Steel BarRound Bar,Flat Bar,Square BarΦ8-1200mm*LForging,hot rolling and cold rolling,CastBlack,Rough Turning,Shot Blasting,
Coil/StripSteel Coil/Steel Strip0.03-16.0x1200mmCold-Rolled&Hot-RolledAnnealed,Solution and Aging,Q+T,ACID-WASHED,Shot Blasting
Pipes/TubesSeamless Pipes/Tubes,Welded Pipes/TubesOD:6-219mm x WT:0.5-20.0mmHot extrusion,Cold Drawn,WeldedAnnealed,Solution and Aging,Q+T,ACID-WASHED
Cross Reference Table(Equivalent Grade)
GradeStandardCountryApplication
HEV2UNESpain
Steel for exhaust valves
N07002UNESpain
Steel for exhaust valves

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