Lork Manufacture 17-7pH/AISI 631/1.4568 High Precipitation Steel for High Temperature Parts 631 Stainless Steel Coil

Product Description

Product Description

 

Introduction

LORK is a special stainless steel manufacturer with 20 years of manufacturing experience.
 

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.

Duplex Stainless 17-7PH 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.
 

Weldability

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.

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

Hot Working
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.

17-7ph (631) 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

 

17-7PH 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

17-7PH/631 stainless steel plate sizes and specifications
Grade	17-7PH/631/UNS S17700/SUS631
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

Detection

Processing

 

Packaging & Shipping

Company Profile

FAQ

Q1: Do you accept the trial order ?
A1: Yes,if we have the exactly size in stock.we can delivery even 1 piece/meter .

Q2: Can I have free sample before making orders?

A2: Yes,we can supply free sample as requirement,but buyer needs to pay the freight charges ,the freight fee will return to buyer after making order.

Q3: How do you control the quality ?
A3: MTC and PMI will be sent before shipment,any 3rd party inspection if need .

Q4: How about your delivery time ?
A4: Generally delivery time is 15 working days .

Q5: How can I quickly get the price list ?
A5: Directly click "chat now" or send us email with detail specifications,you will get the official price list in 1 hour .