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17-4 Precipitation Hardening (Type 630/UNS S17400) is a chromium-copper precipitation hardening stainless steel designed for applications requiring high strength and moderate corrosion resistance. This alloy maintains high strength up to approximately 600°F (316°C).
General Properties
Alloy 17-4 PH is a precipitation hardening martensitic stainless steel with copper and niobium/columbium additions. This grade combines high strength, hardness (up to 572°F/300°C), and corrosion resistance. Mechanical properties can be optimized through heat treatment, achieving very high yield strength up to 1100-1300 MPa (160-190 ksi).
This grade should not be used above 572°F (300°C) or at very low temperatures. It provides adequate resistance to atmospheric corrosion and diluted acids or salts, with corrosion resistance equivalent to Alloy 304 or 430.
Alloy 17-4 PH withstands corrosive attacks better than standard hardenable stainless steels and is comparable to Alloy 304 in most media. For stress corrosion cracking risks, higher aging temperatures above 1022°F (550°C), preferably 1094°F (590°C), should be selected.
1022°F (550°C) is the optimum tempering temperature in chloride media, while 1094°F (590°C) is optimal for H2S media. The alloy may experience crevice or pitting attack in stagnant seawater but provides corrosion resistance in chemical, petroleum, paper, dairy, and food processing industries (equivalent to 304L grade).
Chemical Composition
Table 1: Composition ranges for grade 630 stainless steels
Element
Min (%)
Max (%)
C
-
0.07
Mn
-
1.00
Si
-
1.00
P
-
0.04
S
-
0.030
Cr
15.0
17.5
Ni
3.0
5.0
Cu
3.0
5.0
Nb+Ta
0.15
0.45
Mechanical Properties
Table 2: Mechanical properties of grade 630 stainless steels
Condition
Tensile Strength (MPa)
Yield Strength 0.2% Proof (MPa)
Elongation (% in 50mm)
Hardness Rockwell C (HRC)
Hardness Brinell (HB)
Solution Treated
1105 typ
1000 typ
15 typ
38 max
363 max
Condition 900
1310 min
1170 min
10 min
40 min
388 min
Condition 1150
930 min
724 min
16 min
28 min
277 min
Physical Properties
Table 3: Typical physical properties of grade 630 stainless steels
Property
Value
Density (kg/m³)
7750
Mean Coefficient of Thermal Expansion 0-100°C (µm/m/°C)
10.8
Mean Coefficient of Thermal Expansion 0-315°C (µm/m/°C)
11.6
Thermal Conductivity at 100°C (W/m·K)
18.4
Thermal Conductivity at 500°C (W/m·K)
22.7
Specific Heat 0-100°C (J/kg·K)
460
Electrical Resistivity (nΩ·m)
800
Alternative Grade Comparison
Table 5: Possible alternative grades to 630 stainless steels
Alternative Grade
Selection Considerations
431
Higher toughness than 17-4PH, better availability in some sizes
Higher corrosion resistance for severe environments, but with much lower strength than 17-4PH
2205
Much better corrosion resistance than 17-4PH, with lower strength (but not as low as 316)
Heat Treatment
Solution treatment (Condition A): Grade 630 stainless steels are heated at 1040°C for 0.5 hours, then air-cooled to 30°C. Small sections can be oil quenched.
Hardening: Grade 630 stainless steels are age-hardened at low temperatures to achieve required mechanical properties. During processing, superficial discoloration occurs followed by shrinkage.
Applications
Engine components
High strength boat propeller shafts
Plastic molding dies
Valves and gears
Product Images
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer
Year Established:
2012
Total Annual:
500,000,000-800,000,000
Employee Number:
100~200
Ecer Certification：
Verified Supplier
Company Overview ：
The company has an indoor warehouse of 5000 square meters and an open warehouse of 4000 square meters, which can fully meet the temporary turnover and phased storage of customers' steel pipe reservation.
The subordinate processing plant has 6 sets of medium frequency h... Company Overview ：
The company has an indoor warehouse of 5000 square meters and an open warehouse of 4000 square meters, which can fully meet the temporary turnover and phased storage of customers' steel pipe reservation.
The subordinate processing plant has 6 sets of medium frequency h...
