Product : 17-4PH Stainless Steel
Kategori : Martensitic Precipitation Hardening Stainless Steel
Standard: AFNOR
Grades : 17-4PH
Equivalents
ASTM A693 grade 630, AISI 630, AMS 5604B, UNS S17400, EURONORM 1.4542, X5CrNiCuNb 16-4, AFNOR Z5 CNU 17-4PH, DIN 1.4542, JIS SUS630, SAE AMS 5643, SAE AMS 5604, NACE MR01-75, ISO 15156, PED 97/23/CE, API 6A PSL4 (UT), ASTM A388 (UT), EN10088-3Characteristic
Stainless 17-4 PH adalah baja tahan karat martensitik pengerasan presipitasi dengan penambahan tembaga (Cu) dan Nb / Cb. Grade ini menggabungkan kekuatan tinggi, kekerasan (hingga 300 ° C / 572 ° F) dan ketahanan korosi.
Stainless 17-4 PH memiliki karakteristik fabrikasi yang baik dan dapat mengeras karena usia. Kualitas machinability terbaik ada pada solusi P 800 (H1150M) dan P930 (H 1150).
Stainless 17-4 PH tidak boleh digunakan pada suhu di atas 300 °C (572 °F) atau pada suhu yang sangat rendah. Ini memiliki ketahanan yang memadai terhadap korosi atmosfer atau dalam asam atau garam encer di mana ketahanan korosinya setara dengan kelas 304 atau 430.
Stainless 17-4 PH tahan terhadap serangan korosif lebih baik daripada baja tahan karat seri 400 yang mana pun, dan dalam sebagian besar aplikasi, ketahanan korosinya mendekati ketahanan korosi jenis stainless 303 dan 304.
Precipitation Hardening
Pengerasan presipitasi (precipitation hardening) adalah pengerasan paduan logam dengan pembentukan presipitasi/endapan/menggumpal melalui penyebaran partikel-partikel dari fasa kedua kedalam matrik fasa yang asli/pertama. Hal ini dilakukan dengan perlakuan panas yang tepat. Pengerasan presipitasi sering juga disebut “age hardening” (pengerasan penuaan) karena proses pengerasan terjadi seiring dengan proses waktu
Availability
RoundbarChemical Composition (%)
| C | Si | Mn | P | S | Cr | Ni | Cu | Nb | Mo |
| 0.04 Max | 0.40 Max | 0.80 Max | 0.040 Max | 0.030 Max | 15.00-17.50 | 3.00-5.00 | 3.00-5.00 | 0.15-0.45 | 0.50 Max |
| PREN (%Cr+3.3%Mo+16%N) ≥17 | |||||||||
Mechanical Properties
| Heat treatment | YS 0.2% N/mm_ |
UTS N.mm_ |
YS 0.2% ksi |
UTS ksi |
EI% | ||||||
| Min. | Typ. | Min. | Typ. | Min. | Typ. | Min. | Typ. | Min. | Typ. | ||
| A | 1070 | 1207 | 1170 | 1310 | 155 | 175 | 170 | 190 | 8 | 14 | |
| B | 790 | 931 | 965 | 1034 | 115 | 135 | 140 | 150 | 10 | 17 | |
A: hardening 496°C (925°F) - 4 hours - air cooling
B: hardening 593°C (1100°F) - 4 hours - air cooling
2 examples of heat treatments that may be applied.
Tensile strength at delivery form approx 800-110 N/mm2
Very high yield strength up to 1100-1300 MPa (160-190 ksi) can be achieved.
Elevated temperature properties
Minimum guaranteed values following EN 10088 hot rolled plates.
The EN guaranteed values are valid for a thickness from 3/16" up to 3".
| Temperature °C Temperature °F | 100 212 | 150 302 | 200 392 | 250 482 | 300 572 | |
| YS 0.2% | N/mm_ | 730 | 710 | 690 | 670 | 650 |
| ksi | 106 | 103 | 100 | 97 | 95 | |
Heat treatment : hardening 590°C (1094°F) - 4 hours - air cooling.
1 example of heat treatments that may be applied
Impact Values
Minimum guaranteed values following ASTM A693 hot rolled plates.The ASTM guaranteed values are valid for a thickness from 3/16" up to 3".
| Heat treatment | KV transverse | |
| J | ft.lbf | |
| Hardening 593°C (1100°F) - 4 hours - air cooling | 20 | 15 |
Hardness
Minimum guaranteed values following ASTM A693 hot rolled plates.The ASTM guaranteed values are valid for a thickness from 3/16" up to 3".
| Heat treatment | Hardness | |
| Rockwell | Brinell | |
| Hardening 496°C (925°F) - 4 hours - air cooling | C38 | 375 |
| Hardening 593°C (1100°F) - 4 hours - air cooling | C29 | 293 |
Corrosion Resistance
Stainless 17-4 PH withstands corrosive attacks better than any of the standard hardenable stainless steels and is comparable to type 304 in most media.If there are potential risks of stress corrosion cracking, the higher aging temperatures then must be selected over 550°C (1022°F), preferably 590°C (1094°F). 550°C-1022°F is the optimum tempering temperature in chloride media.
590°C-1094°F is the optimum tempering temperature in H2S media.
17-4 PH is subject to crevice or pitting attack if exposed to stagnant seawater for any length of time.
It is corrosion resistant in some chemical, petroleum, paper, dairy and food processing industries (equivalent to 304L grade).
Physical Properties
Have been obtained after hardening 480°C (896°F) – 1 hour - air cooling.| Interval Temperature °C |
Thermal expansion ax10-6°C-1 |
°C | °F | Thermal conductivity (W.m-1.K-1) |
Young modulus (GPa) |
| 0-100 | 10.8 | 20 | 68 | 14 | 197 |
| 0-200 | 11 | 100 | 212 | 16 | 193 |
| 0-300 | 11.3 | 200 | 392 | 18.5 | 186 |
| 0-400 | 11.6 | 300 | 572 | 20 | 180 |
| 0-500 | 12 | 400 | 752 | 22 | 175 |
| 500 | 932 | 23 | 170 | ||
| Properties (Room temp) | 17-4PH | |
| Resistivity (ยต_.cm) | 80 | |
| Specific heat (J.kg-1.K-1) | 460 | |
| Tension modulus (GPa) | 77 | |
| Density kg/m3 (.28 lbs/in3) | 7800 |
Heat Treatment
Hardening condition P800 or P930 has to be solution annealed before hardening Max obtainable hardness 44 HRC (for more details please turn over)
Martensitic transformation
Indicative values
Ms : 130°C (266°F)
Mf : 30°C (86°F)
Solution annealing
1050°C +/-25°C (1925°F+ /-50°F) – 30 min up to 1 hour.
air cooling / oil quenching below 25°C (76°F)
Tempering
The highest mechanical properties are obtained with the following heat treatment: 480°C (896°F) – 1 hour – air cooling.
Higher ductilities are obtained when using higher aging temperatures up to 620°C (1148°F).
Applications
Offshore (foils, helicopter deck platforms, etc.)Food industry
Pulp and paper industry.
Aerospace (turbine blades, etc.)
Mechanical components
Nuclear waste barrel
Parts used in Chemical process
Parts used in Mechanical process
Aircraft & gas turbines
Paper mills & oil fields
Source:
"The effect of microstructural evolution on hardening behavior of type 17-4PH stainless steel in long-term aging at 350 °C" Jun Wanga, b, Hong Zoub, Cong Lib, Shao-yu Qiub, Bao-luo Shena
a School of Materials Science and Engineering, Sichuan University, Chengdu, 610065, PR China
b Nuclear Power Institute of China, Chengdu, 610041, PR China
"Improving the mechanical properties of 17-4PH stainless steel by low temperature plasma surface treatment" M.F. Yan *, R.L. Liu, D.L. Wu
* School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China
http://www.sandmeyersteel.com/17-4PH-spec.html
http://www.quantumalloys.com/data/ground/cro17-4.html
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20070034041.pdf
http://www.sciencedirect.com/
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