Ck75 1.1248 MK75 - DIN 17222-1979

Grade	Ck75
Germany W-Nr.	1.1248
Old Grade
Corresponding Standard	DIN 17222-1979 Cold Rolled Steel Strips for Springs Technical Condition of Delivery
Classification	Carbon Steel

Ck75 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S
Minimum Value	0.7	0.15	0.6	-	-
Maximum Value	0.8	0.35	0.8	0.035	0.035

Ck75 Mechanical Properties

thickness t mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Elongation or Extension Rate δ %	Hardness HBW
t<3*	Cold rolled and soft annealing (G)	≤640	≥12	HV** ≤190
t≤2.5****	Cold rolled, quenching and tempering (H+A)	*** 1320~1870		390~555
t≤2.5	Quenching			≥700

New and Old Grade Replacement List

Approximate Comparison Table Spring Steel

Ck75 Corresponding Standards(Same grade name, different standards)

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!