High Strength Stainless Steels

NAS 630

Produced specially for superior strength, NAS 630 is used in steel belts and press plates. Providing excellent corrosion resistance equivalent to 18-8 austenitic stainless steel and high mechanical performance at the same level as annealing hardening chromium stainless steel, NAS 630 is ideal for belts and press plates requiring a high level of strength. Nippon Yakin supplies this product in coil, sheet and plate forms.

  • Image: Coil
    Coil
  • Image: Sheet
    Sheet
  • Image: Plate
    Plate

Designation / Standard

Nippon Yakin Grade ASTM A693 EN JIS
NAS 630 UNS S17400 ― SUS 630

Back to top

Chemical Composition

  C Si Mn Ni Cr Mo N
Min ― ― ― 3.00 15.00 3.00 0.15
Max 0.07 1.00 1.00 5.00 17.50 5.00 0.45

Back to top

Physical Properties

Specific resistivity (μΩ･cm) 98
Thermal conductivity (W/m･K) 18.0
Coefficient of thermal expansion (10-6/℃) 0–100℃

10.8
0–400℃ 11.3
Young's modulus (MPa) 19.6 x 104
Ferromagnetism Yes

Back to top

Mechanical Properties

ASTM A693 / UNS S17400

  0.2% proof stress
(N/mm2)		 Tensile strength
(N/mm2)		 Elongation
(%)		 Hardness
(HB)
Solution treatment,
0.38–102-mm thick		 ≤ 1105 ≤ 1255 ≥ 3 ≤ 363
H900 treatment,
4.762–15.88-mm thick		 ≥ 1170 ≥ 1310 ≥ 8 388–477
H1150 treatment,
4.762–15.88-mm thick		 ≥ 725 ≥ 930 ≥ 10 269–352

Back to top

Weldability

NAS 630 can be welded with the same sorts of techniques as a standard austenitic stainless steel. To obtain the maximum welding efficiency, use the standard solution and H900 treatments after welding.

Heat Treatment

Supplied in a solid solution heat treated form, NAS 630 requires precipitation hardening heat treatment as shown below after working to ensure the maximum mechanical performance is reached. If ductility is required, we recommend H1150, which can be machined after precipitation hardening.

  • H900 heat treatment condition: 400 to 490℃ Air cooling
  • H1150 heat treatment condition: 610 to 630℃ Air cooling

Pickling

To remove thin scales from aging and welding scales, we recommend immersion in warm nitric-fluoric acid (10 percent nitric acid, 2 percent hydrofluoric acid).

Applications

NAS 630 provides corrosion resistance nearly equal to a standard austenitic stainless steel, and has the functional performance of a highly hardenable chromium stainless steel. With the additional advantage that the hardening treatment temperature is so low that little deformation results from heat strain, NAS 630 is ideal for steel belts.

Back to top