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![Boron-alloyed case hardening steels](/images/uploads/1c3c8837-cafa-4961-9c16-8cf3415aecfd/boron-alloyed-case-hardening-steels-category-forged-blanks-1920x1080.jpg)

Category · 1 grade

# Boron-alloyed case hardening steels

Boron-alloyed case hardening steels are low-carbon alloy steels designed to develop a hard surface with a tougher core after case hardening. Their boron addition improves hardenability, while the alloying composition supports the production of durable gears, shafts and other wear-prone components.

| Grade | Material no. | B | C | Si | P | S | Cr |
|---|---|---|---|---|---|---|---|
| [18MnCrB5](/materials/din-en/18mncrb5 "18MnCrB5") | [1.7168](/materials/material-no/1.7168 "1.7168") | 0,0008-0,0050 | 0,16-0,20 | 0,15-0,35 | 0,035 | 0,015-0,035 | 0,90-1,20 |

## Standards covering this category

 1

- [**DIN / EN***1 grade*](/materials/din-en "DIN / EN — 1 grade in this category")

## Property ranges

 1

| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| rho | g/cm³ | 7.85 | 7.85 | 1 |

Derived from 1 grade in this category with a recorded value.

## Composition range

 7

| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| B | % | 0.0008 | 0.005 | 1 |
| C | % | 0.16 | 0.2 | 1 |
| Si | % | 0.15 | 0.35 | 1 |
| P | % | 0.035 | 0.035 | 1 |
| S | % | 0.015 | 0.035 | 1 |
| Cr | % | 0.9 | 1.2 | 1 |
| Mn | % | 1 | 1.3 | 1 |

Derived from 1 grade in this category with a recorded value.

## Related guides

 2

- [**Case Hardening Methods for Steel**](/wiki/heat-treatment/case-hardening-methods-for-steel "Case Hardening Methods for Steel")
- [**Steel Tempering Response and Secondary Hardening**](/wiki/heat-treatment/steel-tempering-response-and-secondary-hardening "Steel Tempering Response and Secondary Hardening")