17-4PH Stainless Steel

TYPICAL ANALYSIS:

C.	Si.	S.	P.	Mn.	Ni.	Cr.	Cu.	Nb./Cb.+Ta.
0.03%	0.30%	0.02%	0.02%	0.80%	4.50%	15.50%	3.25%	0.25%

Comparable standards: UNS17400 Type 630
                                           ASTM A564 Type 630

17-4PH is a precipitation-hardening martensitic stainless steel, which combines high strength and hardness (after heat treatment) with excellent corrosion resistance, and is suitable for easy fabrication.

Solution Treatments.

As supplied 17-4PH, is usually in the solution treated condition, (Condition A). It can be heat treated at different temperatures to off a wide range of properties. (We also hold stock in HH1150).

Condition	Hardening Temperature	Hardening Time (Hours)	Type of Cooling	Hardness
				Brinell	Rockwell C
A	1038° C	½	Oil/Air (to below 32° C)	363 max.	39 max.
H 900	480° C	1	Air	420	44
H 925	495° C	4	Air	409	42
H 1025	550° C	4	Air	352	38
H 1075	580° C	4	Air	341	36
H 1100	595° C	4	Air	332	35
H 1150	621° C	4	Air	311	33
H 1150 +1150	760° C 760° C	4 followed by 4	Air Air	302	31
H 1150-M	760° C 620° C	2 followed by 4	Air Air	277	27

Typical Mechanical Properties

	Condition
	A	H900	H925	H1025	H1075	H1100	H1150	H1150 +1150		H1150-M
Tensile Strength
N/mm2	1034	1380	1310	1170	1140	1035	1000	965	860
0.2% YS
N/mm2	760	1275	1200	1140	1035	930	860	760	585
Reduction of Area
%	30-60	50	54	56	58	58	60	60	68
Elongation
%	6-15	14	14	15	16	17	19	20	22
Charpy Impact
J	-	20	34	47	54	61	68	108	13

Welding

Arc and resistance welding processes used on standard grades of stainless steel are applicable to 17-4PH Stainless Steel. The low hardness enables sections, up to 100mm, to be welded without requiring preheating.

Corrosion Resistance

17-4PH Stainless Steel has excellent corrosion resistance. Corrosion tests and service experience have shown that in all aged conditions it is superior to standard hardenable stainless grades such as 420, 431 and 410 stainless. Its corrosion resistance is comparable to grade 304 stainless.

Fabrication

17-4PH Condition A is suitable for limited cold forming. H1100, H1150 and overaged conditions are more suitable when severe cold forming is required.

Machining

Machining 17-4PH Condition A has machining characteristics similar to stainless grades 302, 304 and 410. The high hardness and strength in Condition H900 is the most difficult to machine and the material should be machined at 60% of the rate used for Condition A.

Nitriding

To increase the resistance to surface wear, with a slight decrease in corrosion resistance, 17-4PH Stainless Steel can be nitrided. An approximate hardness of 64/67Rc can be achieved, with a surface hardness depth of up to 0.150mm, when nitrided at 540° C, while still maintaining a high core strength.

If further information is required, on other physical and chemical properties, or stocked sizes and availability please contact our sales office.

For price and availability contact our friendly and helpful staff.