U11A, U11, N11E, N11 - carbon tool steel
Table of content:
| Standard | Grade | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chemical composition % | |||||||||||||||
| C: | Si: | Mn: | P: | S: | Cr: | Ni: | Cu: | ||||||||
| GOST | U11A - У11А | ||||||||||||||
| 1.05-1.14 | 0.17-0.33 | 0.17-0.33 | <0.025 | <0.018 | <0.2 | <0.25 | <0.25 | ||||||||
| GOST | U11 - У11 | ||||||||||||||
| 1.05-1.14 | 0.17-0.33 | 0.17-0.33 | <0.030 | <0.028 | <0.2 | <0.25 | <0.25 | ||||||||
| PN | N11E | ||||||||||||||
| 1.05-1.14 | 0.15-0.30 | 0.15-0.30 | <0.025 | <0.025 | <0.15 | <0.2 | <0.2 | ||||||||
| PN | N11 | ||||||||||||||
| 1.05-1.14 | 0.15-0.35 | 0.15-0.35 | <0.030 | <0.030 | <0.2 | <0.25 | <0.25 | ||||||||
| GB | T11A | ||||||||||||||
| 1.05-1.14 | <0.35 | <0.4 | <0.030 | <0.020 | <0.25 | <0.2 | <0.3 | ||||||||
| GB | T00113 | ||||||||||||||
| 1.05-1.14 | <0.35 | <0.4 | <0.030 | <0.020 | <0.25 | <0.2 | <0.3 | ||||||||
| MSZ | S111 | ||||||||||||||
| 1.05-1.14 | 0.15-0.35 | 0.15-0.35 | <0.025 | <0.025 | <0.2 | <0.25 | <0.25 | ||||||||
| MSZ | S112 | ||||||||||||||
| 1.05-1.14 | 0.15-0.35 | 0.15-0.35 | <0.025 | <0.025 | <0.2 | <0.25 | <0.25 | ||||||||
U11A and U11 steels – description
Tool steel for machining and cuttining tools, but not heavy-duty ones. It is hard, as well as abrasion, impact and shock resistant.
Like other carbon steels, it contains low amounts of chromium, copper and nickel, thus it is not corrosion resistant.
Main features:
- Very hard
- Adequate grinding resistance
- Adequate impact resistance
Applications
This alloy is widely used for:
- Screw taps
- Die nuts
- Reamers
- Drills
- Hack-saws
- Special knifes
- Lathe centres
- Punching dies
Physical and mechanicla properties
Hardness is one of the most important features of this steel.
| Norm | Grade | Max HB hardness as soft annealed | Max HB hardness as quenched |
|---|---|---|---|
| TGL | C110W2 | 210 | 65 |
| TGL | C110W1 | 210 | 65 |
| GOST | U11 | 207 | 62 |
| GOST | U11A | 207 | 62 |
| SEW | 43981 | 212 | 62 |
| SEW | 43982 | 212 | 62 |
| DIN | C105W1 | 213 | - |
| NF | Y1105 | - | 64 |
| PN | N11 | 207 | 62 |
| PN | N11E | 200 | 64 |
| ČSN | 192221 | 210 | 64 |
| ČSN | 19191 | 207 | 60 |
| BS | BW1B | 207 | - |
Other properties:
| Grade: | N11 | N11E | U11A |
|---|---|---|---|
| Electrical resistivity: | 1.96 μΩ*m | 1.96 μΩ*m | - |
| Density: | 7.830g/cm3 | 7.830g/cm3 | 7.8g/cm3 |
| Specific heat capacity: | 485 J/kg*K | 485 J/kg*K | - |
| Linear expansion coefficient: | 10.30 (10^6)/OC | 10.30 (10^6)/OC | - |
Quenching
U11 differs from U11A in it’s hardenability. U11 is a deep hardening steel and U11A is a shallow hardening one.
| Largest grain size / hardening depth, mm | Temperature [℃] | ||||||
|---|---|---|---|---|---|---|---|
| 760 | 800 | 840 | 880 | ||||
| Deep hardening steel N11 | 7 / 5 | 7 / 6 | 6 / 8 | 5 / 12* | |||
| Shallow-hardening steel N11E | 7 / 3 | 7 / 4 | 7 / 4 | 7 / 5 | |||
* ATTENTION! Hardening cracks on a fracture might be present.
Heat treatment and plastic working
Following parameters are recommended for working and heat treatment
| N11E heat treatment and forging | ||
|---|---|---|
| Process | Cooling | Temperature [℃] |
| Forging | sand or ash | 1000–800℃ |
| Soft annealing | any | 680–710℃ |
| Stress relief | slow | 600-700℃ |
| Quenching | water | 760-780℃ |
| Tempering | air | 180-300℃* |
* The chosen tempering temperature impacts the final hardness of a tool.
Welding
Welding is hard and should be considered only as a mean to repair.
Following coated electrodes may be used: EN 450 B, ENS 50 B, ENS 15CrB, EN 350 B, ENS 18, EN 600 B, WBEN 280 MoB.
We deliver this steel alloy as:
Replacements, equivalents and other designations:
N11E, T11A, T00113, U11, U11A, 1.1545, S111, S112, N11, У11А, У11