structure:singlematerial:20crmntiplace of origin:zhejiang, china (mainland)model number:u-jointbrand name:swc,swp,swl,swz u-jointu-joint series:swc u-jointu-joint size:38*83-245*532u-joint used:industrial equipment1.u-joint raw material :20cr/20crmnti(structural alloy steel):
   for spider:20cr / 20crmnti;
   for bushing:20cr/gcr15;
   for needle roller:gcr15.
   for cross assembly: 20crmnti
2.u-joint chemical component:
c
si
mn
cr
p
s
0.18~0.24
0.17~0.37
0.50~0.80
0.70~1.00
≤0.030
≤0.030
3.u-joint mechanical property:
material no.
heat treatment
surface
hardness
tensile strength
(σb)
yield strength
(σs)
flexure-torsion fatigue
(σ-1)
shear fatigue
(τ-1)
bending stress
[σ-1]
20cr
carburizing
quenching
temper
58~64hrc
640
390
305
160
60
4.function of u-joint assembly
1).safety factor of static torsion strength:≥2.0
2).torsional fatigue life: ≥1.5x105  cycle index.
3).wearing life: ≥60h .
5.heat treatment of u-joint 
spider:
1).surface hardness:58-64hrc
2).inner hardness:25-45hrc  or 38-48hrc(20crmnti)
6.bearing cap:
1).surface hardness:58-64hrc
2).the depth of effective hardened layer:0.3~0.7mm.
3).metallography structure:m+a’1-5 level.

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