Supply High Quality 631/S17700/1.4541/AMS 5528/ASTM A693 Rod for Processing 17-7pH Stainless Steel Round Bar

• Customization: Available
• Type: Alloy Steel Bar
• Standard: AISI, ASTM, DIN, JIS, GB
• Model NO.: 17-7pH Rod/Bar
• Composition: Other
• Technique: Hot Rolled
• Shape: Bar
• Surface Treatment: Galvanized
• Special Use: High-strength Steel Plate, Wear Resistant Steel, Silicon Steel, Cold Heading Steel
• Application: Structural Steel Bar
• Key Words: 17-7pH Bar/Rod
• Thickness: 2mm - 100mm
• Outside Diameter: 4.0 - 1219mm
• Length: as Your Requirments
• Diameter Tolerance: H9, H11, H13, K9, K11, K13 etc
• Sample: Free-Sample
• Surface: Lack, Peeled, Polishing, Bright, Sand Blast, Hl
• MOQ: 100kgs
• Stock: in Stock
• Transport Package: Wooden Package
• Specification: 17-7pH
• Trademark: LORK
• Origin: China
• HS Code: 7219350000
• Production Capacity: 50000kg/Month

Product Description

Product Description

Introduction

17-7 PH is a precipitation-hardened stainless steel that is well suited for aerospace and other applications requiring high strength and good corrosion resistance and formability. Type 17-7 PH is a Chromium-Nickel-Aluminum, austenitic stainless steel.  It is the most formable of all PH grades and has the highest strength and hardness. It is less magnetic than other PH grades and offers minimal distortion upon heat treatment. This material maintains its valuable properties at temperatures up to 800°F (427° C).

The two main properties of precipitation-hardened stainless steels are high corrosion resistance and high strength. Stainless steel grade 17-7 PH is a precipitation hardened stainless steel that possesses high strength and hardness, excellent fatigue properties, good formability, good corrosion resistance, and minimal distortion upon heat treatment. The properties of this alloy are well suited for aerospace applications.

Stainless steel grade 17-7 PH is suitable for use in fresh water and industrial atmospheres, and mild chemical and oxidizing environments. It is recommended that 17-7 PH should not be used in salt water or reducing environments.

Composition
Chemical Composition (wt%) limits as specified in ASTM A693 (Type 631)

 

Element	17-7PH
Carbon	0.09
Chromium	16.0-18.0
Nickel	6.5-7.7
Manganese	1.00
Silicon	1.00
Aluminum	0.75-1.50
Phosphorus	0.040
Sulfur	0.030

Grade Specification

Grade	UNS	DIN	EN	AMS	ASTM		JIS
17-7 PH(631)	S17700	1.4541		AMS 5528 AMS 5529 AMS 5644	ASTM A 693		-

Mechanical Properties
Mechanical property requirements for solution treated product (Condition A) as specified in ASTM A693.

Property	17-7PH ≤ 0.010 inch thick	17-7PH > 0.010 inch thick
Yield Strength, min. (ksi)	65	55
Tensile Strength, min. (ksi)	150	150
Elongation, min. (%)	-	20
Hardness, max. (Rb)	-	92

 

Physical Properties
17-7 PH is a registered trademark of AK Steel Corporation

Property	17-7 PH
Density, lb/in3	0.282
Modulus of Elasticity, psi	29 x 10^6
Coefficient of Thermal Expansion, 68-212˚F, /˚F	8.5 x 10^-6
Thermal Conductivity, Btu/ft hr ˚F	9.5
Specific Heat, Btu/lb ˚F	0.11
Electrical Resistivity, Microohm-in	31.5

Processing method

Machinability
Machinability of stainless steel grade 17-7 PH is rated at 75 % of B1112. On machining, this alloy displays long gummy chips and requires chip breakers. It is recommended that slow speeds and constant feeds while machining will provide excellent results.

Heat Treatment
For heat treating stainless steel grade 17-7 PH, three important steps need to be carried out - austenite conditioning, cooling to transform the austenite to martensite, and precipitation hardening to condition TH 1050 or RH 950.

Forming
Forming characteristics of stainless steel grade 17-7 PH are similar to stainless steel grade 301. For radical forming operations, intermediate annealing may be required.

Welding
Common arc and resistance methods can be used with stainless steel grade 17-7 PH. It is recommended that during fusion welding inert gas shielding should be performed to reduce the oxidation of aluminum during the process.

Annealing
Annealing of stainless steel grade 17-7 PH is performed at 1066°C (1950°F) for 3 min for every 0.1 inch (2.5 mm) of thickness, and then air cooled.

Aging
Stainless steel grade 17-7 PH is solution annealed at 1177°C (2150°F) for 4 h and air cooled. Same step is performed at 1079°C (1975°F) for 4h and air cooled, then at 843°C (1550°F) for 24h and air cooled, and at 760°C (1400°F) for 16h and air cooled. This completed the precipitation hardening process. For excellent results and performance, the material should be clean and free from scale and impurities.


Applications

Stainless steel grade 17-7 PH is primarily used for applications requiring corrosion resistance, good strength, and mechanical properties up to 427°C (800°F) in operation. It is also commonly used for intricate parts due to its low distortion in heat treatment.

Stainless steel grade 17-7 PH finds uses in the following:

• Variety of springs and washers
• Chemical processing equipment
• Heat exchangers
• Power boilers
• Superheater tubes
• Components used in high-strength/high-temperature conditions

 

 

 

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Process

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