SUP 9 Spring Steel

CHEMICAL COMPOSITION (Typical Analysis in %)

C	Si	Mn	P	S	Cr
0.52-0.60	0.15-0.35	0.65-0.95	0.030 max	0.035 max	0.65-0.95

USA	Germany	China	Japan	France	England	ISO
AISI / SAE	DIN, WNr	GB	JIS	AFNOR	BS	ISO
5155 / G51550	55Cr3 / 1.7176	55CrMnA	SUP9	55C3	~527A60	55Cr3

SUP9 Steel is a high quality cold work spring steel, It belong to the high quality high carbon alloy spring steel. Oil quenched and tempered hardness is 28-34 HRC. SUP 9 Spring Steel annealing delivery hardness less than 250HB.

APPLICATIONS

SUP 9 Spring Steel, highlight the advantage is great hardenability, another hot working performance, comprehensive mechanical properties, decarburization resistance is additionally great big cross section of various important spring. For example, automobile, locomotive, large plate spring, spring etc. SUP9 spring is mainly used for heavy vehicles, tractors, industrial production load, stress and the diameter of the larger plate spring and helical spring.

ANNEALING

Slowly heat to 740~770°C and let the steel be completely heated, then allow it to cool slowly in the furnace. The SUP9 steel will get 250HB.

HARDENING

SUP 9 Spring Steel should be heated uniformly to 830~860°C (1526-1580°F) until completely heated through. About 30 min per 25 mm of ruling section is to be provided and then the steels should be immediately quenched in oil.

TEMPERING

Tempering of SUP9 steel is performed at 460-510°C, Soak well at the selected temperature and soak for at least one hour per 25 mm of total thickness.

Tensile Strength	Conditions to Yield Strength	Elongation	Reduction of Area	Hardness (Hot Rolled)
≥1225 (125)	σ0.2 (MPa) ≥1080 (110)	δ5 (%) : ≥ 9	Ψ (%) : ≥ 20	≤321HB

SIZE RANGE

WIRE ROD – ROUND – AS ROLLED -8 MM to 32 MM DIA (If required we can also supply in spheroidize annealed condition.)

ROUND BARS –  We can provide round bar sizes up to 90mm if required by customer against advanced orders.

STOCKING PARTNERS
We keep the materials from Europe and India.