Steel 17X18H9
Steel 17Cr18Ni9
Steel 17Cr18Hr9: a classifier of steels and alloys. Below is systematized information on the purpose, chemical composition, types of supply, substitutes, critical point temperatures, physical, mechanical, technological and foundry properties for the grade — Steel 17Cr18Ni.
General information about steel 17X18H9
| Grade substitute |
| steel 20Х13Н4Г9. |
| Delivery type |
| Bar stock, including shaped: GOST 5949−75, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated rod GOST 7417−75, GOST 8559−75, GOST 8560−78. Grinded rod and silver GOST 14955−77, GOST 18907−73. Sheet thick GOST 7350−77. Thin sheet GOST 5582−75. GOST 4405−75 GOST 103−76 stripe. GOST 18143−72 wire. Forgings and forged blanks GOST 1133−71. Tubes GOST 9940−81, GOST 9941−81. |
| Application |
| Cold-rolled high-strength plates and strips for various parts and structures subjected to spot welding. Corrosion-resistant austenitic grade steel. |
Chemical composition of steel 17Х18Н9
| Chemical element | % |
| Silicon (Si), not more | 0.8 |
| Manganese (Mn), not more than | 2.0 |
| Copper (Cu), not more than | 0.30 |
| Nickel (Ni) | 8.0−10.0 |
| Sulfur (S), not more than | 0.020 |
| Titanium (Ti), not more than | 0.5 |
| Carbon (C) | 0.13−0.21 |
| Phosphorus (P), not more than | 0.035 |
| Chrome (Cr) | 17.0−19.0 |
Mechanical properties of steel 17Х18Н9
| Heat treatment, delivery condition | Section, mm | σB, MPa | δ5, % | δ4, % |
| Rods. Hardened at 1050−1100°C, air, oil, water. | 60 | 570 | 40 | |
| Ground rods, machined to the specified strength | 1−30 | 590−880 | 20 | |
| Cored bars | <5 | 930 | ||
| Pre-bent bars | >5 | 880 | ||
| Hot- or cold-rolled sheets. Hardened at 1080−1120°C, water | >4 | 588 | 35 | |
| Hot- or cold-rolled sheets. Hardened 1050−1100°C, water or air | >4 | 590 | 35 | |
| Plate hardened | <3,9 | 980−1220 | 13 | |
| Plate, semi-blasted | <3,9 | 730−980 | 18 | |
| Cold rolled strip. Hardened 1050−1080°C, water or air | <0,2 | 580 | 17 | |
| Cold rolled strip. Hardened 1050−1080°C, water or air | 0,2−2,0 | 580 | 24 | |
| Semi-naked cold-rolled steel strip | <0,2 | 800 | 8 | |
| Cold rolled flat rolled steel strip | 0,2−2,0 | 800 | 15 | |
| Cold rolled flat rolled steel tape | <0,2 | 1000 | 3 | |
| Cold-rolled flat steel tape | 0,2−2,0 | 1000 | 5 | |
| Cold-rolled high-temperature rolled steel strip | <0,2 | 1150 | 2 | |
| Cold-rolled high-hardened steel strip | 0,2−2,0 | 1150 | 3 | |
| Heat-treated wire | 0,2−1,0 | 590−880 | 20 | |
| Bulk wire | 0,2−1,0 | 1080 | ||
| Seamless hot-deformed pipes without heat treatment | 3,5−32 | 568 | 40 | |
| Heat-treated cold- and heat-treated seamless hot-deformed pipes | 0,2−22 | 568 | 35 |
Mechanical properties at elevated temperatures
| t test,°C | σ0, 2, MPa | σB, MPa | δ5, % | ψ, % | ||||||||||
| Tempering at 1100 °C. | ||||||||||||||
| 20 | 380 | 830 | 45 | 51 | ||||||||||
| 600 | 350 | 560 | 33 | 55 | ||||||||||
| 700 | 210 | 410 | 33 | 52 | ||||||||||
| 800 | 190 | 255 | 34 | 64 | ||||||||||
| 900 | 150 | 45 | 81 | |||||||||||
| 1000 | 47 | 53 | 86 | |||||||||||
Mechanical properties depending on the degree of plastic deformation
| Heat treatment, delivery condition | σ0, 2, MPa | σB, MPa | δ5, % |
| Degree of deformation — 0% | 500 | 830 | 67 |
| Deformation rate — 10% | 750 | 950 | 45 |
| Degree of deformation — 20% | 900 | 1050 | 38 |
| Degree of deformation — 30% | 1030 | 1150 | 25 |
| Degree of deformation — 40% | 1140 | 1230 | 21 |
| Level of deformation — 50% | 1220 | 1300 | 18 |
| Degree of deformation — 60% | 1280 | 1350 | 17 |
| Degree of deformation — 70% | 1350 | 1400 | 12 |
Technological properties of steel 17Х18Н9
| Forging temperature |
| Beginning temperature 1200, ending temperature 850. Sections up to 350 mm are cooled in air. |
Impact toughness of steel 17X18H9
Impact strength, KCU, J/cm2
| Delivery condition, heat treatment | +20 | -40 | -80 |
| The rod with a cross section of 25 mm. Hardened 1100 C, water. | 294 | 294 | |
| Bar cross section of 20 mm. Hardened at 1150 C, water. | 349 | 387 | 362 |
| Bar cross section of 22 mm. 1150 C, water hardened. b0,2 = 260 MPa, bv = 710 MPa. | 304 | 267 | 245 |
Corrosion properties of steel 17X18H9
| Medium | Test temperature,°C | Depth, mm/year |
| 0.5−99% HNO4 solution | 20 | 0,1 |
Physical properties of steel 17Х18Н9
| Test temperature,°C | 20 | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900 |
| Modulus of normal elasticity, E, GPa | 199 | 147 | ||||||||
| Steel density, pn, kg/m3 | 7850 | |||||||||
| Thermal conductivity coefficient W/(m — °C) | 18 | 19 | 20 | 21 | 22 | 24 | 25 | 26 | 27 | 28 |
| Electrical resistivity (p, nominal value — m) | 720 | 735 | 855 | 925 | 975 | 1031 | 1080 | 1115 | 1150 | 1185 |
| Test temperature,°C | 20−100 | 20−200 | 20−300 | 20−400 | 20−500 | 20−600 | 20−700 | 20−800 | 20−900 | 20−1000 |
| Coefficient of linear expansion (a, 10−6 1/°C) | 16.0 | 17.0 | 17.5 | 17.9 | 18.5 | 18.6 | 18.9 | 19.1 | 19.3 | 19.5 |
| Specific heat capacity (C, J/(kg -°C)) | 504 |
