Hot Rolled Bright Surface 17-4PH Stainless Steel Round Bar OD 6-300mm AISI 630
Price:
2.58
MOQ:
50
Delivery Time:
Negotiable
Product Description
17-4PH Stainless Steel Overview
17-4 Precipitation Hardening (Type 630) 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 at temperatures 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.
Applications & Standards
| Applications | Standards |
|---|---|
|
|
Corrosion Resistance
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 | Content (%) |
|---|---|
| C | 0.07 max |
| Mn | 1.0 max |
| Si | 1.0 max |
| P | 0.04 max |
| S | 0.030 max |
| 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 (HR C) | 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 Co-eff of Thermal Expansion 0-100°C (µm/m/°C) | 10.8 |
| Mean Co-eff 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 Grades Comparison
Table 5: Possible alternative grades to 630 stainless steels
| Alternative Grade | Reasons for Choosing 17-4PH (630) |
|---|---|
| 431 | 431 has higher toughness than 17-4PH. Better availability in some sizes. |
| 416 | Free-machining martensitic stainless steel - better for repetition machining. Lower cost. |
| 316 | Higher corrosion resistance to resist more 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 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 at 0.10% for condition H1150, and 0.05% for condition H900.
Typical Applications
- Engine components
- High strength and boat propeller shafts
- Plastic moulding dies
- Valves and gears
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Company
TSING SHAN STEEL INDUSTRIAL LIMITED
Location
NO.288,Youyi Road Xi Shan Dristrict , Wuxi, Jiangsu, China
Contact Person
Gao Ben