Annealing, quenching and heat treatment of high-speed steel
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Technical characteristics of heat treatment
| steel grade | Hardness | Temperature, ° С | |||
| after annealing | after quenching with tempering, HRC (HRCe), min | quenching | vacations | ||
| НВ, not more than | diameter of print, mm, min | ||||
| P18 | 255 | 3.8 | 63 (62) | 1270 | 560 |
| P6M5 | 255 | 3.8 | 64 (63) | 1220 | 550 |
| 11P3AM3F2 | 255 | 3.8 | 64 (63) | 1200 | 550 |
| P6M5F3 | 269 | 3.7 | 65 (64) | 1220 | 550 |
| Р12Ф3 | 269 | 3.7 | 64 (63) | 1250 | 560 |
| Р18К5Ф2 | 285 | 3.6 | 64 (63) | 1280 | 570 |
| P9K5 | 269 | 3.7 | 64 (63) | 1230 | 570 |
| P6M5K5 | 269 | 3.7 | 65 (64) | 1230 | 550 |
| P9M4K8 | 285 | 3.6 | 65 (64) | 1230 | 550 |
| P2AM9K5 | 285 | 3.6 | 65 (64) | 1200 | 540 |
Permissible deviations from the given temperatures should not exceed ± 10 ° С.
At the request of the consumer, the steel grades P12F3, P9K5, P6M5F3, P6M5K5 are manufactured with a hardness not exceeding 255 HB (the diameter of the print is not less than 3.8 mm), steel R18K5F2, P9M4K8 — with a hardness not exceeding 269 HB (the diameter of the print is not less than 3, 7 mm). In the macrostructure, steel is not allowed: plowing, stratification, bubbles, inclusions and cracks.
Defects
Macro-structure defects are allowed that do not exceed the values indicated below.
| Defect type | Diameter, thickness of metal products, mm | Score in points, not more, for groups | |
| I | II | ||
| Shrinkage segregation | All sizes | 1 | 1 |
| Central porosity | Up to 80 | - | 1 |
| 80 to 150 | 1 | 2 | |
| «150» 200 | 2 | - | |
| Point-spotted heterogeneity | Up to 50 | - | 1 |
| Holy 50 to 80 | - | 2 | |
| «80» 150 | 1 | 2 | |
| «150» 200 | 2 | - | |
Carbide heterogeneity
| Diameter of a circle or side of a square, mm | Score in points, not more, for groups | |
| I | II | |
| Up to 20 | - | 2 |
| St. 20 to 40 | - | 3 |
| «40» 60 | - | 4 |
| «60» 80 | - | 5 |
| «80» 100 | 5 | 6th |
| «100» 150 | 6th | 7th |
| «150» 180 | 7th | - |
| «180» 200 | 8 | - |
Supplier Avlob offers to buy high-speed steel at a bargain price. The price is the best in this segment of rental.
GOST 9013−59
Hardness after hardening and tempering is determined by GOST 9013−59 on samples taken from the finished profile. The inspection is carried out on a plane perpendicular to the drawing direction. The number of prints on each sample must be at least three. Cooling of the samples after quenching is carried out in oil. The samples are dispensed two, three times, with an exposure of 1 h and cooling in air.
The grain size of the austenite after quenching
| Diameter or thickness of metal products, mm | The austenite grain size is not larger than the number | |
| by the Sneider-Graff method | on a scale | |
| Up to 50 | 13 | 10 |
| S.50 | 10 | 9 |
Carbide heterogeneity in points
| Score | Description of distribution carbide phase |
Allowable width of strips, mm | |
| in high-strength steels (with evaluation on the scale of N 1) |
in low-tungsten and tungsten-molybdenum steels (with an estimate on the scale of N 2) | ||
| 1 | Thin banded structure with short broken strips | 2 | 1 |
| 2 | Banded structure, single or multiple band distributions. Carbides inside strips, crushed | 4 | 2 |
| 3 | A. Banded structure, single or multiple bands. Carbides inside strips, crushed | 6th | 4 |
| B. The remains of a torn carbide mesh. Grid with crushed carbides | 6th | 4 | |
| 4 | A. Banded structure. Single or multiple bands. Carbides inside strips, crushed | 8 | 5 |
| B. Slightly torn mesh with clusters | 8 | 5 | |
| 5 | A. Rough-band structure, single or multiple bands | 13 | 6th |
| B. Explicitly expressed ruptured grid with clusters | 13 | 6th | |
| 6th | A. Rough-band structure, single or multiple bands | 15 | 9 |
| B. An explicitly broken mesh with the presence of undisturbed cluster cells | 15 | 9 | |
| 7th | Grid torn in separate places and clusters | 20 | 14 |
| 8 | Malodeformed tear and mesh | 25 | 18 |
For the strip, a cluster of carbides is taken, whose length is greater than or equal to 5 times the width. Two adjacent bands are taken as one, if the distance between them is less than the width of the narrower band.
Delivery, price
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