New Factory 1.4568/S17700/17-7pH/ASTM A693 Stainless Steel Tube for The Aerospace Industry 631 Steel Pipe

• Customization: Available
• Type: Seamless
• Technique: Cold Rolled
• Model NO.: 631 Tube/Pipe
• Material: Alloy Steel
• Surface Treatment: Polished
• Usage: Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose
• Section Shape: Round
• Key Words: 631 Tube/Pipe
• Thickness: 3mm - 150.0mm
• Width: 1000mm - 3000mm
• 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: 631
• Trademark: LORK
• Origin: China
• HS Code: 7219350000
• Production Capacity: 50000kg/Month

Product Description

Product Description

Introduction

Custom 631 (17Cr-7Ni) is a semi-austenitic, precipitation-hardening stainless steel that provides high strength when sufficiently cold drawn and then aged. With corrosion resistance similar to 304 it is designed to provide an austenitic structure in the annealed condition with excellent cold drawability for high-strength wire applications. To achieve age-hardening properties, Custom 631 (17Cr-7Ni) must be cold drawn.
SUS631 is the most typical precipitation hardening type steel that can be heat treated to increase hardnesswhile retaining the excellent performance of 18-8 stainless steel.From the softest solution-treated to the hardest full hard rolled, depending on the processing andapplication, it is possible to have a strength second only to high-carbon martensitic quenched materials byapplying various heat treatments.
In the solution heat-treated state, more than 30% elongation allows for strong processing such as drawingPlease note that the material is weakly magnetic in the solution heat-treated state, but becomes quitestrongly magnetic after precipitation hardening treatment.
This material is hard to obtain due to its relatively small distribution volume, and most of the materialsdistributed in stock sales are 3/4H finish. However, we can provide from the softest material in solution heat.treated condition (A material) to the hardest material with full hard finish (EH) per your use and processingmethod in small lot.

Composition

The table below provides the compositional ranges of grade 631 stainless steels:

Composition ranges of grade 631 stainless steels

Grade		C	Mn	Si	P	S	Cr	Ni	Al
631	min. max.	- 0.09	- 1.0	- 0.5	- 0.025	- 0.025	16 17.25	6.50 7.75	0.75 1.25

Grade Specification

Grade	UNS	DIN	EN	AMS	ASTM		JIS
631(17-7PH)	s17700	-	1.4568/10088	-	ASTM A693		-

Characteristic

• high strength
• corrosion resistance
• high hardenss
• minimum distortion upon heat treatment
• fatigue resistant
• excellent formability

Processing method

Forming Option

1 Hot rolling process
2 Hot Forging: Electro-hydraulic; High-speed-hydraulic; Oil-hydraulic; Precision-forging

Heat-treatment Option

1 +A: Annealed (full/soft/spheroidizing)
2 +N: Normalized
3 +NT: Normalized and tempered
4 +QT: Quenched and tempered (water/oil)
5 +AT: Solution annealed
6 +P: Precipitation hardened

Suface Option

1 Black Surface
2 Grounded: Bright but rough ; Not precision
3 Machining for plate: Bright and precision; Little turning scar
4 Peeled/Turned: Bright and precision; Little turning scar
5 Polished: Very Bright and precision size; Not turning scar

Heat treatment

Condition A - Saturation at 1065O C
Condition TH1050 - Saturation at 1400 F (760 C) for 1.5 hours, cooled for 1 hour to 55 F (15 C) for 0.5 hours, then aged at 1050 F (566 C) for 1.5 hours
Condition RH950 - Saturation at 1750 F (954 C) for 10 minutes with air cooling, product cooling to -100F (-73 C) for about 1.5 hours, aging at 950 F (510 C) for 1 hour
Condition C - Condition after cold rolling
Condition CH900 - Cold rolled condition after ageing at 900 F (482 C) for 1.0 hours with air cooling

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.

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.

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.

Applications

The material is used on valve parts, tanks, springs, spring washers, food knives, diaphragms, low and high temperature parts, heat exchangers, special fittings and installations, machine constructions and components. Steel is intended for the aerospace, petroleum, chemical and petrochemical industries, energy, food and cryogenic industry in the form of strips, wires, sheets and bars.

 

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