Nippon Yakin Kogyo NAS630 High Strength Stainless Steels

Manufacturer: Nippon Yakin Kogyo Co., Ltd
Model :NAS630

NAS630 (UNS S17400)
High Strength Stainless Steel

NAS630 is a precipitation hardening type of high strength stainless steel. It has excellent corrosion resistance equivalent to that of 18-8 austenitic stainless steels and also provides high strength equivalent to chromium stainless steels, which have a quench-hardening capacity. NAS630 is used in various parts where high strength is required, such as steel belts, high-strength mechanical parts, etc. Nippon Yakin supplies NAS630 in plate, sheet, and strip forms.

Chemical Composition17Cr-4Ni-4Cu-0.2Nb
Product shapeCoilSheetPlate
Heat TreatmentNAS630 is normally supplied in a solution treated condition. However, in order to obtain the maximum mechanical properties, it is necessary to perform H900 precipitation hardening heat treatment after working. If ductility is required, we recommend using H1150 precipitation hardening heat treatment. In this case, it is possible to perform precipitation hardening heat treatment of the base material, as working is also possible after precipitation hardening. Heat treatment conditions: H900 precipitation hardening: 470-490°C; air cooling H1150 precipitation hardening: 610-630°C; air cooling
WeldabilityWelding of NAS630 can be performed using various welding methods in the same manner as with standard type austenitic stainless steels. Maximum welding efficiency can be obtained by performing normal solution treatment + H900 treatment after welding.
PicklingIn pickling of comparatively thick scale after solution treatment or hot working, the methods used with austenitic stainless steels can be used.
ApplicationsSprings, Press plates, Steel belts, Cutting blade.

Steel Grade/Standard

Nippon Yakin GradeJISASTMEN
NAS630SUS630UNS S174001.4542

* If following is the EN standard, please consult with Nippon Yakin in advance.

Chemical Composition

CSiMnPSNiCrCuNb
Specification
(SUS630)
≤0.07≤1.00≤1.00≤0.040≤0.0303.00–5.0015.00–17.503.00–5.000.15–0.45
Specification
(UNS S17400)
≤0.07≤1.00≤1.00≤0.040≤0.0303.00–5.0015.00–17.503.00–5.000.15–0.45

Physical Properties

Density [g/cm³]7.8
Electrical resistivity [μΩ•cm]98
Thermal conductivity [W/m•K]13.7
Average coefficient of thermal expansion [10⁻⁶/°C]0–100°C 10.8
0–400°C 11.3
Young’s modulus [MPa]19.6 × 10⁴
MagnetismFerromagnetic
Melting range [°C]1430–1477

Mechanical Properties

Heat treatmentThickness [mm]Proof stress [MPa]Tensile strength [MPa]Elongation [%]Hardness [HBW]
ASTM A693
UNS S17400
0.38–102≥11105≥1235≥15≥363
NAS630
H900 treatment
4.76–15.88≥1170≥2310≥21269–372
NAS630
H1150 treatment
762≥1240≥30311
NAS630
Solution treatment

Work Hardening and Age Hardening

Corrosion Resistance

Measurements of pitting potential conformed to JIS G 0577 (2005) (test solution: 1600 mL NaCl solution, 30°C)

Heat treatmentPotential (VC=10)Potential (VC=100)
NASH630
Solution treatment
0.1150.124
NASH630
H900 treatment
0.124
NASH630
H1150 treatment
0.0870.095

Heat Treatment

NAS630 is normally supplied in a solution-treated condition. However, to obtain the maximum mechanical properties, it is necessary to perform H900 precipitation hardening heat treatment after working. If difficulty is required, we recommend using H1150 precipitation hardening heat treatment.

[Heat treatment conditions]

  • H900 precipitation hardening: 470–490°C; air cooling
  • H1150 precipitation hardening: 610–630°C; air cooling

Weldability

Welding of NAS630 can be performed using various welding methods in the same manner as with standard type austenitic stainless steels. ER630 welding rods, which have the same composition, are frequently used.

Pickling

In pickling of comparatively thick scale after solution treatment or hot working, the methods used with austenitic stainless steels can be used.

Applications

  • Springs
  • Press plates
  • Steel belts
  • Cutting blades

 

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