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El721

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E1712 E1740
#El721

Description

Spain UNE El721 Spain structural alloy steel and El721 Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Structure Steel: El721
Category Type Steel Grade Standard Country Application
Steel GradesStructure Steel El721 UNE Spain Spain structural alloy steel
28Cr4
28CcS4
C10E
C10R
C15E
C15R
C16E
CUR
E1711
E1712

Chemical composition(mass fraction)(wt.%) of the El721

C(％) Si(％) Mn(％) P(％) S(％) Cr(％) Mo(％)
0.28-0.35 0.15-0.40 0.40-0.70 0.035 0.035 2.30-2.80 0.30-0.50

Mechanical Properties of steel grade El721

Yield
Rp0.2 (MPa)		 Tensile
Rm (MPa)		 Impact
KV/Ku (J)		 Elongation
A (%)		 Reduction in cross section on fracture
Z (%)		 As-Heat-Treated Condition Brinell hardness (HBW)
579 (≥) 786 (≥) 12 31 21 Solution and Aging, Annealing, Ausaging, Q+T,etc 234

Physical Properties of steel grade El721

Temperature
(°C)		 Modulus of elasticity
(GPa)		 Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and Thermal conductivity
(W/m·°C)		 Specific thermal capacity
(J/kg·°C)		 Specific electrical resistivity
(Ω mm²/m)		 Density
(kg/dm³)		 Poisson’s coefficient, ν
32 - -     0.22 -  
181 897 - 21.3 241   -  
954 - 21 13.2   434 221

Heat Treatment of steel grade El721

Heat treated : 1848°C - 1498°C

Technological Curves of steel grade El721

Cross Reference Table (Equivalent Grade) of El721

Grade Standard Country Application
El721 UNE Spain Spain structural alloy steel
E1712 E1740
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Jiangyou Longhai Special Steel Co.,Ltd.
Jiangyou Longhai Special Steel Co.,Ltd.

Our main peoducts of steel are many kinds of special steel, like tool steel, mould steel, alloy steel, alloy constructural steel, heat-resistant steel, high speed tool steel,spring steel and bearing steel , stainless steel and so on, which have formed 12 series and more than 350 varieties with n...

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