20HN3A
20HN3A is a designation in PN for the material held under material number 1.5919, also listed as 17CrNi6-6. It is a material in the category Case hardening steels. We list 29 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, AFNOR, JIS, GB, GOST, ČSN, PN, COPANT, SRPS and BDS.
If you came for one of these
The most-used names for this grade.About Case hardening steels
Case hardening steels are steels designed to develop a hard, wear-resistant surface while retaining a tough and ductile core. They are used for components such as gears, shafts and other machine parts exposed to contact wear and cyclic loading.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Also known as
29 designations · 12 standards · nothing hidden- 15HNIndicative
- 20HN3AIndicative
Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.
Chemical composition
10 elements on file · weight %What this alloy is
Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade.
| Element | % by weight |
|---|---|
0.12–0.18 | |
≤ 0.25 | |
0.4–0.7 | |
0.02 | |
0.015 | |
1.35–1.65 | |
1.35–1.65 | |
≤ 0.2 | |
0.025–0.05 | |
0.012 |
The scale is logarithmic, not the element’s raw share of the alloy — the only honest way to fit 0.01 % and 100 % in one picture, and it means every value here can be compared with every other.
| Element | As publishedsource text, verbatim | Min% by weight | Max% by weight | Bound |
|---|---|---|---|---|
| C | 0,12-0,18 | 0.120 | 0.180 | Range |
| N | 0,012 | 0.012 | 0.012 | Exact |
| Al | 0,025-0,050 | 0.025 | 0.050 | Range |
| Si | ≤0,25 | — | 0.250 | Max |
| P | 0,02 | 0.020 | 0.020 | Exact |
| S | 0,015 | 0.015 | 0.015 | Exact |
| Cr | 1,35-1,65 | 1.350 | 1.650 | Range |
| Mn | 0,40-0,70 | 0.400 | 0.700 | Range |
| Ni | 1,35-1,65 | 1.350 | 1.650 | Range |
| Cu | ≤0,20 | — | 0.200 | Max |
The published column is the source string byte-for-byte, decimal comma and all; Min and Max are the parsed bounds. Elements not listed have no value on file — they are omitted, never inferred.
Predicted transformation temperatures
Not enough recorded composition to predict a transformation temperature for this grade — missing: Mo.
Physical & mechanical properties
An absent property means we hold no value for it — it is left out rather than estimated, interpolated from a neighbouring grade, or filled from a handbook. It does not mean the property is undefined for the material.
Heat treatment
Supply condition
- Carburizing
- Quenching and Temperingd=25
- Quenching
Conditions the standard permits on delivery. No temperature or medium is published for these, so no order and no alternation is implied.
Source: www.caishuku.com
Similar grades — and why
Selection rule, stated so you can disagree with it: same number class 1.5, a shared category, and a published range for Cr / Ni that overlaps this grade’s. These are neighbours in composition space — they are not equivalents, and none is claimed to be interchangeable with this grade.
Looking for this grade under another name?
Search the catalogue by designation, material number or composition — every name on this page is itself a way in.