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17-4 Precipitation Hardening (Type 630) is a chromium-copper precipitation hardening stainless steel used for applications requiring high strength and moderate corrosion resistance. High strength is maintained to approximately 600°F (316°C).
General Properties
Alloy 17-4 PH is a precipitation hardening martensitic stainless steel with Cu and Nb/Cb additions. The grade combines high strength, hardness (up to 572°F / 300°C), and corrosion resistance.
Mechanical properties can be optimized with heat treatment. Very high yield strength up to 1100-1300 MPa (160-190 ksi) can be achieved.
This grade should not be used at temperatures above 572°F (300°C) or at very low temperatures. It has adequate resistance to atmospheric corrosion or in diluted acids or salts where its corrosion resistance is equivalent to Alloy 304 or 430.
Applications & Standards
Applications
Standards
Offshore (foils, helicopter deck platforms, etc.)
Food industry
Pulp and paper industry
Aerospace (turbine blades, etc.)
Mechanical components
Nuclear waste casks
ASTM A693 grade 630 (AMS 5604B) UNS S17400
EURONORM 1.4542 X5CrNiCuNb 16-4
AFNOR Z5 CNU 17-4PH
DIN 1.4542
Corrosion Resistance
Alloy 17-4 PH withstands corrosive attacks better than any of the standard hardenable stainless steels and is comparable to Alloy 304 in most media.
If there are potential risks of stress corrosion cracking, higher aging temperatures above 1022°F (550°C), preferably 1094°F (590°C), must be selected. 1022°F (550°C) is the optimum tempering temperature in chloride media, while 1094°F (590°C) is optimum in H2S media.
The alloy is subject to crevice or pitting attack if exposed to stagnant seawater for extended periods. It is corrosion resistant 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
Content (%)
C
max 0.07
Mn
max 1.00
Si
max 1.00
P
max 0.04
S
max 0.030
Cr
15.00 - 17.50
Ni
3.00 - 5.00
Cu
3.00 - 5.00
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
Possible alternative grades to 630 stainless steels:
431: Higher toughness than 17-4PH, better availability in some sizes
316: Higher corrosion resistance but with much lower strength than 17-4PH
2205: Much better corrosion resistance 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 h, 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 the process, superficial discoloration occurs followed by shrinkage.
Machining & Welding
Machining: Grade 630 stainless steels can be machined in their solution-treated condition with machining rates similar to grade 304 steels.
Welding: Grade 630 stainless steels can be welded using all conventional methods without pre-heating. Care should be taken in designing and welding high strength steels to prevent weldment stresses.
Applications
Engine components
High strength and boat propeller shafts
Plastic moulding dies
Valves and gears
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Distributor/Wholesaler,Exporter
Total Annual:
>1000000
Employee Number:
>100
Ecer Certification：
Verified Supplier
Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative... Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative...
