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Lork ASTM A564 Type 630 H1150 Stainless Steel Bar for Aerospace Components 17-4pH Rod

17-4PH is one of the most popular and most commonly used stainless chromium-nickel alloy steels with copper additive, precipitation hardened with martensitic structure. It is characterized by high corrosion resistance while maintaining high strength properties, including hardness.

Steel can operate in the temperature range from -29 ºC to 343 ºC, while retaining relatively good parameters. In addition, the materials in this grade are characterized by relatively good ductility and their corrosion resistance is comparable to 1.4301 / X5CrNi18-10.

Bearing in mind that it is a precipitation hardened steel, it should be applied after supersaturation and aging. In the delivery condition +A, the products show no martensitic structure, resulting in significantly less corrosion resistance

Duplex Stainless 17-4PH Applications

Aerospace Industry. 17-4 PH is useful in the aerospace industry because it has excellent resistance to corrosion and great tensile strength. ...

Pulp & Paper Industry. ...

Nuclear Industry. ...

Food Processing Industry. ...

Motor & Pump Shafts. ...

Oil & Gas Industry.

Weldability

This grade has a good weldability and doesn't normally need preheating, but welding design should be well evaluated in order to avoid situations prone to generate stress. In short, small sections could be welded in the solution treatment condition followed by an aging; large or heavy sections require a high temperature aging or overaging obviously followed by a new solution treatment (cond. A) and an aging.

Corrosion Resistance
This grade has the same general resistance corrosion as 304 but better than the group of standard martensitic 400 series. However, solution treatment (cond. A) without aging should be avoided. For maximum resistance to Chloride stress corrosion cracking, it should be aged at a higher temperature, not less than 550-580°C. In Sulfide aggressive environments, age at 620° C or overage. The same choice should be done in the case of situations or environments prone to cause H-embrittlement. It should also be noted that for this grade, as for every kind of stainless steel, surfaces should be free of contaminants and scale, and passivated for optimum resistance corrosion.

Cold Working
This grade has a limited cold deforming capacity in the annealed condition (cond.A) due to untempered Martensite. More severe cold working requires aging at the highest temperature or overaging. For restoring or increasing mechanical properties, such as Tensile Rm, a new solution treatment (cond.A) followed by a suitable aging temperature should be carried out.

Hot Working
Ingots or large forgings require a suitable preheating in order to avoid thermal cracking. Avoid overheating and improper cooling. Large forging bars should be equalized at 1030 -1040°C in the heating furnace prior to cooling. Both small or large forgings, rolled rings or bars must be cooled under 30°C after solution treatment (cond. A) in order to complete the transformation of martensite, obtaining both a good structure and mechanical properties after aging. It is useful to point out that a certain amount of Ferrite could be in the V174 structure.

17-4ph (630) Chemical Composition

 

	Min. %	Max %
C		0.07
Si		1.0
Mn		1.0
Ni	3.0	5.0
Cr	15.0	17.5
Cu	3.0	5.0
Nb	0.15	0.45
P		0.04
S		0.03

17-4PH Mechanical Properties

Condition	Subtype	RM(N/MM²)	HBW	RP0.2% (N/MM²)	E4D(%)
S-A	AT	1200 max	360 max	-	-
S-A-A	H900	1310 min	380 min	1170 min	10 min
S-A-A	H925	1170 min	375 min	1070 min	10 min
S-A-A	H1025(P1070)	1070 min	331 min	1000 min	12 min
S-A-A	H1075	1000 min	311 min	860 min	13 min
S-A-A	H1100(P960)	965 min	302 min	795 min	14 min
S-A-A	H1150(P930)	930 min	277 min	725 min	16 min
S-A-D	H1150M(P800)	795 min	255 mim	520 min	18 min
S-A-D	H1150D	860 min	255-311	725 min	16 min

Heat Treatment

(S-A solution annealed, S-A-A solution annealed-aged, S-A-D solution annealed double aged)

	Condition	Min Temp.°C	Max Temp. °C	Cooling
S-A	AT	1025	1050	Air
S-A-A	H900	480	-	Air
S-A-A	H925	495	-	Air
S-A-A	H1025(P1070)	550	-	Air
S-A-A	H1075	580	-	Air
S-A-A	H1100(P960)	595	-	Air
S-A-A	H1150(P930)	620	-	Air
S-A-D	H1150M(P800)	760+620	-	Air
S-A-D	H1150D	620+620	-	Air

Available Sizes And Specifications

 

17-4PH (630) stainless steel profile sizes and specifications
Grade	17-4PH (630)
Specification	EN, DIN, JIS, ASTM, BS, ASME, AISI, ISO
Standard	ASTM A276/ASME SA276, ASTM A479/ASME SA479 & ASTM A164/ASME SA164 .
Stainless steel round Bar	Diameter: 2mm - 600mm
Stainless steel bright Bar	Diameter: 2mm - 600mm
Stainless steel hex Bar	Dimension: 6mm - 80mm
Stainless steel square bar	Dimension: 3.0 - 180mm
Stainless steel flat bar	Thickness: 0.5mm - 200mm, Width: 1.5mm - 250 mm
Stainless steel angle bar	as requirements
Length	Normally 6m, or produce as requirements
Surface	Black, Bright. Peeled and Polished, Solution annealed.
Delivery condition	cold drawn, hot rolled, forged, grinding, centerless grinding
Tolerance	H8, H9, H10, H11, H12, H13,K9, K10, K11, K12 or as per clients' requirements

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