630 (1.4542) stainless steel is a quality of stainless steel which is used in our country and in the world more and more with aging, or in other words it is a mixture of chrome and nickel containing austenitic and martensitic stainless steel which is included in the cured hardened stainless steel group.
630 grade stainless steel and other grade stainless steels can provide various benefits according to other grades. One of the most important of these is that stainless steels which are included in this group show corrosion resistance to both austenitic stainless steels and they have the property of gaining highly resistance through heat treatment such as martensitic stainless. The most commonly used quality in this stainless group is 17-4 PH (17% chromium and 4% nickel contained in its name).
630 - PH 17.4 Quality Stainless Steel Bill of Materials (1.4542)
Min Diameter (mm)
Max Diameter (mm)
Stainless Steel Rod
Min Edge (mm)
Max Edge (mm)
Stainless Steel Llama
Min thickness: 25mm, max thickness: 100mm
Min width: 50mm, max width: 200mm
Stainless Steel Square
Min measure: 30x30mm
Max measure: 60x60mm
630 quality stainless steel, high mechanical strength, high hardness and has a good price-performance ratio, the world is a rapidly growing steel type. 630 grade stainless is frequently used in pump and valve shafts, kitchen appliances, petrochemical industry, chemical plants and stainless steel decoration materials.
1.4542, namely PH 17-4, is one of the areas where this stainless quality is used most frequently in the defense industry. This stainless steel material, which is preferred in defense industry in our country, is used frequently because of its high mechanical values and long life.
Mechanical Properties at Room Temperature
630 (1.4542) X5CrNiCuNb16-4
~ 1090 MPa
Yield strength, (0.2%)
~ 950 MPa
Hardness, Rockwell (HB)
Solution treatment (Condition A) — Grade 630 stainless steels are heated at 1040°C for 0.5 h, then air-cooled to 30°C. Small sections of these grades can be oil quenched.
Hardening — Grade 630 stainless steels are age-hardened at low temperatures to achieve the required mechanical properties. During the process, superficial discoloration occurs followed by shrinkage at 0.10% for condition H1150, and 0.05% for condition H900.
Typical mechanical properties of grade 630 steels achieved after solution treating
Typical Hardness Rockwell C
Tensile Strength (MPa)
Grade 630 stainless steels can be welded using all conventional methods, and they do not require pre-heating. Care should be taken in designing and welding of high strength steels to prevent weldment stresses.
Grade 630 stainless steels can be machined in their solution-treated condition. They have machining rates similar to that of grade 304 steels.
Some of the major applications of grade 630 stainless steels include:
High strength and boat propeller shafts
Plastic moulding dies
Valves and gears