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High precipitation 17-7PH/631 stainless steel round bar with random length

Short Description:

One of the most frequently used in the the aerospace industry and when meticulous, elaborate parts are needed, 17-7 PH stainless steel is a common choice.
A stable, chromium-nickel-aluminum steel, 17-7 is a precipitation hardening steel with a high strength and moderately resistant to corrosion. In terms of corrosion resistance, 17-7 PH is comparable to 304 stainless steel and a better choice when compared to the 400 series of stainless steel.
17-7 PH is further strengthened by a low temperature precipitation hardening treatment (also termed aging). The industry standard is to age Condition R material at 950°F for one hour, resulting in an end condition of RH 950. Condition T material is aged at 1050°F for 90 minutes, resulting in an end condition of TH 1050. Typical room temperature mechanical properties are listed in Table 2. Very high strength properties are obtained. TH 1050 provides more ductility at a reduced strength level.


Product Detail

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Applications

Grade 17-7 stainless steel is mostly found in washers and springs.
It is used in applications which require high strength and corrosion resistance
It is also used in intricate parts due its low distortion on heat treatment.

Forming

Grade 17-7 stainless steel has forming characteristics similar to that of 301 stainless steel. Intermediate annealing can be done for radical forming operations.

Welding

Grade 17-7 stainless steel can be welded using arc and resistance welding techniques. Inert gas shielding is preferred during fusion welding in order to reduce oxidation of aluminum. It is not necessary to perform pre-heating and post-weld annealing processes.

Heat Treatment

Solution treated material is heavily cold worked which results in condition C material.
Condition C material is heated at 482°C (900°F) for 1 h in condition CH900 followed by cooling. Solution treated material is heated at 955°C (1750°F) for 10 min after fabrication in condition A1750 followed by rapidly cooling at room temperature.
Within 1 h of treating to condition A1750, it is cooled at -73°C (-100°F) for 8 h in condition R100. It is then heated at 510°C (950°F) for 90 min in condition RH 950 followed by cooling. After fabrication, it is heated at 760°C (1400°F) for 90 min in condition T.
Within 60 min of cooling, it is then cooled at 13°C (55°F) for 30 min. From condition T, it is heated at 565°C (1050°F) for 90 min in condition TH1050 followed by cooling.

Cold Working

Grade 17-7 stainless steel can be easily cold worked using common methods in the condition A.

Annealing

Grade 17-7 stainless steel is annealed at 1066°C (1950°F) for 3 min for 0.1 in. (2.5 mm) of thickness followed by air cooling.

Aging

Aging of grade 17-7 stainless steel can be done at 1177°C (2150°F) for 4 h followed by cooling. This process is followed by heating at 1078°C (1975°F) for 4 h and cooling. It is again heated at 844°C (1550°F) for 24 h and cooled, and heated at 760°C (1400°F) for 16 h followed by cooling to complete precipitation hardening process.

Chemical Composition

Element Content (%)
Iron, Fe 70 - 75%
Chromium, Cr 16.0 - 18.0
Nickel, Ni 6.50 - 7.75
Silicon, Si 1.0
Manganese, Mn 1.0
Aluminum, Al 0.75 - 1.50
Carbon, C 0.090
Sulfur, S 0.040
Phosphorous, P 0.040

Mechanical Properties

Properties Metric Imperial
Tensile strength 1275 MPa 184900 psi
Yield strength 1030 MPa 149000 psi
Fracture toughness (longitudinal, 44 HRC) 76 MPa-m½ 69.2 ksi-in½
Elastic modulus 204 GPa 29588 ksi
Poisson's ratio 0.27-0.30 0.27-0.30
Elongation at break 6% 6%
Reduction of area 10% 10%
Hardness, Rockwell C 41 41

Available Sizes And Specifications

631 stainless steel plate sizes and specifications
Grade 631
Cold rolled stainless steel plate Thickness: 0.3mm- 16.0mm, Width: 1000mm - 2000mm,
Length: as requirements, Surface: 2B/BA/SB/8K/HL/1D/2D etc
Hot rolled stainless steel sheet Thickness: 3.0mm - 300mm, Width: 1000mm - 3000mm
Length: as requirements, Surface: No.1/pickling
Standard ASTM A240/A480, ASTM B688, ASTM B463/SB463, ASTM B168/SB168, ASTM B443/SB443/B424/SB424B625/SB625 B575/SB575, JIS G4303,
BS 1449, DN17441, G4305
Stainless steel plate Thickness: 8.0mm - 300mm, Width: 1000mm - 3000mm
Length: as requirements, Surface: No.1/pickling
631 stainless steel strip sizes and specifications
Grade 631
Cold rolled stainless steel strip Thickness: 0.3mm- 3.0mm, Width: 5mm - 900mm,
Surface: 2B/BA/SB/8K/HL/1D/2D etc
Hot rolled stainless steel strip Thickness: 3.0mm - 16mm, Width: 10mm - 900mm
Surface: No.1/pickling
Stainless steel foil Thickness: 0.02mm- 0.2mm, Width: Less than 600mm, Surface: 2B
Standard ASTM A240/A480, ASTM B688, ASTM B463/SB463, ASTM B168/SB168, ASTM B443/SB443/B424/SB424B625/SB625 B575/SB575, JIS G4303,  BS 1449, DN17441, G4305
631 stainless steel coil sizes and specifications
Grade 631
Cold rolled stainless steel coil Thickness: 0.3mm- 3.0mm, Width: 1000mm - 2000mm,Surface: 2B/BA/SB/8K/HL/1D/2D etc
Hot rolled stainless steel coil Thickness: 3.0mm - 16mm, Width: 1000mm - 2000mm
Surface: No.1/pickling
 Standard ASTM A240/A480, ASTM B688, ASTM B463/SB463, ASTM B168/SB168, ASTM B443/SB443/B424/SB424B625/SB625 B575/SB575, JIS G4303,   BS 1449, DN17441, G4305
631 stainless steel pipe sizes and specifications
Grade 631
Stainless steel seamless pipe Outside diameter: 4.0 - 1219mm, Thickness: 0.5 -100mm,Length: 24000mm
Stainless steel welded pipe Outside diameter: 6.0 - 2800mm, Thickness: 0.3 -45mm,Length: 18000mm
Stainless steel capillary pipe Outside diameter: 0.4 - 16.0mm, Thickness: 0.1 -2.0mm,Length: 18000mm
Stainless steel seamless sanitary pipe Outside diameter: 6.0- 219mm, Thickness: 1.0 -6.0mm
Stainless steel square pipe Side Length: 4*4 - 300*300mm, Thickness: 0.25 - 8.0mm, Length: 18000mm
Stainless steel rectangular pipe Side Length: 4*6 - 200*400mm, Thickness: 0.25 - 8.0mm, Length: 18000mm
Stainless steel coil pipe Outside diameter: 0.4 - 16mm, Thickness: 0.1 - 2.11mm
Standard American Standard: ASTM A312, ASME SA269, ASTM A269, ASME SA213, ASTM A213 ASTM A511 ASTM A789, ASTM A790, ASTM A376, ASME SA335, B161, SB163, SB338, SB667/668
Germany Standard: DIN2462.1-1981, DIN17456-85, DIN17458-85·
European Standard: EN10216-5, EN10216-2
Japanese Standard: JIS G3463-2006, JISG3459-2012
Russian Standard: GOST 9941-81
631 stainless steel profile sizes and specifications
Grade 631
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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