China Manufacturer Special Steel High Quality Stainless Steel 17-4PH SUS630 for Petrochemical & Refinery

17-4 Precipitation-Hardening Stainless Steel

Material Performance

17-4PH stainless steel is a magnetic precipitation hardening--martensitic stainless steel with special metallic elements copper and niobium.17-4PH stainless steel is the most widely used material of all the precipitation-hardening stainless steels.

After heat treatment, the mechanical properties will be more perfect, and the tensile strength can reach the compressive strength of 1100-1300 Mpa (160-190 ksi). This grade cannot be used above 300°C (572°F) or very low temperature (impact AKV -60°C≥45J).It has good corrosion resistance to the atmosphere diluted acid and salt, just same as 304 and 430.

Features:High hardness, good toughness, good wear resistance, good corrosion resistance, good attenuation performance, strong anti-fatigue and anti-dropping performance.

Itsvaluable combination of properties gives designers opportunities to add reliability to their products while simplifying fabrication and often reducing costs.

Material Standards

Composition Comparison

REMARK:The content of P can be customized.(p≤0.025,p≤0.03)

Heat treatment and Mechanical Properties

Type 17–4 PH steel is hardened by heating solution-treated material, condition A, to between 900/ºF (480ºC) and 1150ºF (620ºC) for one to four hours, depending upon the temperature, then air cooling.

As supplied 17-4PH, is usually in the solution treated condition, (Condition A). It can be heat treated at different temperatures to off a wide range of properties.

Type of Cooling

1.Solid Solution：Water Cooling/Air Cooling

2.Aging Treatment：Air Cooling

Delivery Condition

1.Solid Solution/Annealing

Heat at 1900ºF (1040ºC) for 30 minutes and cool to below 90ºF (32ºC) to allow complete

transformation to martensite. Sections less than 3’’ may be quenched in a suitable liquid while those sections over 3’’ should be rapidly air cooled. Parts should not be used in the solution – treated condition due to possible problems with stress corrosion cracking.

 2.Solid Solution+Aging Treatment(Customized according to customer requirements)

For condition H900 heat solution-treated material at 900ºF (480ºC) for 1 hour and air cool.

For conditions H925, H1025, H1075, H1100, H1150: heat solution-treated material at appropriate temperature ± 15ºF (± 8ºC) for 4 hours and air cool.

Processing Equipment

20 tons complete electric arc furnace,AOD refining,LF refining,VD vacuum smelting equipment, 1.5 tons and 5 tons ESR equipment,5 tons and 10 tons forging hammers,7.5 meters and 9 meters chamber annealing furnaces,straightening machines , peeling machine, grinding machine, polishing machine, lathe and other production&processing equipment ,etc.

Testing Equipment

Direct reading spectrometer, hardness tensile and impact testing machine, ultrasonic nondestructive flaw detector,metallurgical microscope,etc.

 All the following can be tested:inclusions, retained austenite, grain size, low temperature impact (AKV -30°C ≥ 45J, AKV -45°C ≥ 45J, AKV -60°C ≥ 45J, etc.), flaw detection,ultrasonic testing, penetrant testing and other high grades required test.
Advantage

1. Different smelting methods:

EAF+AOD+LF, EAF+AOD+LF+ESR, EAF+AOD+LF+IESR, EAF+AOD+VAR, VIM+VAR.

2. Better cooling: cooling in water to keep the material organization even and stability. Most of suppliers cool in air.

3. All polish bar will be ultrosonic tested or dye-penetrant tested for free before shipment.

4. Impact test can be down as per different industrial requirement: AKV-60℃≥45J、-40℃≥45J、-30℃≥45J、-20℃≥60J、0℃≥60J）

5. Heat Treatment: Solid solution or Solid solution + Aging.

6. Customization: American standard, Japanese standard, European standard and other standards can be customized.

7. Stock: Stock for round bar Ф6-Ф400 is complete.

8. Ferrite content can be controlled as customized(≤1%, ≤3%, ≤5%).

9. Grain size can be ≥6;Inclusions content A,B,C,D,DS can be ≤10.

Diameter Tolerance of Grinding Bar

Application Area