- Model NO.: UNS S17400, Type 630
- Standard: ASTM, AISI
- Certification: ISO
- Technique: Forged
- Dia: Lees Than 3000mm
- Trademark: TONGJI ENGINEERING
- Origin: China
- Type: Stainless Steel Bars
- Grade: 400 Series
- Shape: Round
- Surface Treatment: Machined
- THK: Less Than 100mm
- Specification: OD </= 3000MM
- HS Code: 7304419000
17-4 Precipitation Hardening also known as Type 630 is a chromium-copper precipitation hardening stainless steel used for applications requiring high strength and a moderate level of corrosion resistance. High strength is maintained to approximately 600 degrees Fahrenheit (316 degrees Celsius).
Alloy 17-4 pH is a precipitation hardening martensitic stainless steel with Cu and Nb/CB additions. The grade combines high strength, hardness (up to 572° F / 300° C), and corrosion resistance.
Mechanical properties can be optimized with heat treatment. Very high yield strength up to 1100-1300 MPa (160-190 ksi) can be achieved.
The grade should not be used at temperatures above 572° F (300° C) or at very low temperatures. It has adequate resistance to atmospheric corrosion or in diluted acids or salts where its corrosion resistance is equivalent to Alloy 304 or 430
Offshore (foils, helicopter deck platforms, etc. )
Pulp and paper industry
Aerospace (turbine blades, etc. )
Nuclear waste casks
Alloy 17-4 pH withstands corrosive attacks better than any of the standard hardenable stainless steels and is comparable to Alloy 304 in most media.
If there are potential risks of stress corrosion cracking, the higher aging temperatures then must be selected over 1022° F (550° C), preferably 1094° F (590° C). 1022° F (550° C) is the optimum tempering temperature in chloride media.
1094° F (590° C) is the optimum tempering temperature in H2S media.
The alloy is subject to crevice or pitting attack if exposed to stagnant seawater for any length of time.
It is corrosion resistant in some chemical, petroleum, paper, dairy and food processing industries
|Commodity||17-4 PH Forging, Flat Bar and CNC precision machined products|
|Process method||Forged, CNC Machined|
|Materials Grades||17-4 PH, UNS S17400|
|Standards:||ASTM A182 or closer|
|Size||Ring: OD up to 2000 mm, High to 500 mm or as per drawing. |
Flange:NPS 1/2" to 48" or as per drawing.
Block, Disc: as the request.
|Condition||Anneal, Normalize, Normalize+Temper, Quench+ Temper, as requirements|
|Inspection Testing||Mechanical Test, Hardness Test, Inter-granular corrosion Test.|
Ultrasonic Test, PT, MT, Hydraulic Test, or as required
|Certificate||EN 1024 3.1/ 3.1B/ 3.2, PED, DNV, TUV.|
|Packing||Wooden case/ Steel framed plywood case/ simple packing.|
|Delivery Time||By mutual agreement.|