A387 Grade 9
A387 Grade 9 is a designation in ASTM for the material held under material number 1.7386, also listed as X11CrMo9-1. It is a material in the category Hydrogen resistant steels. We list 17 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, JIS, GOST and ČSN.
If you came for one of these
The most-used names for this grade.About Hydrogen resistant steels
Hydrogen resistant steels are steels designed to withstand hydrogen-related damage, including hydrogen embrittlement and hydrogen attack. They are used for pressure vessels, piping and process equipment exposed to hydrogen-containing environments, where resistance to hydrogen ingress and loss of toughness is important.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Also known as
17 designations · 7 standards · nothing hidden- A 182 F 9This grade’s own name
- A213 T9Indicative
- A335 P9Indicative
- A387 Grade 9Indicative
Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.
Chemical composition
9 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 |
|---|---|
0.08–0.15 | |
0.25–1 | |
0.3–0.6 | |
0.025 | |
0.02 | |
8–10 | |
0.9–1.1 | |
≤ 0.3 | |
≤ 0.04 |
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 | 0,08-0,15 | 0.080 | 0.150 | Range |
| Al | ≤0,040 | — | 0.040 | Max |
| Si | 0,25-1,00 | 0.250 | 1.000 | Range |
| P | 0,025 | 0.025 | 0.025 | Exact |
| S | 0,02 | 0.020 | 0.020 | Exact |
| Cr | 8,00-10,0 | 8.000 | 10.000 | Range |
| Mn | 0,30-0,60 | 0.300 | 0.600 | Range |
| Cu | ≤0,30 | — | 0.300 | Max |
| Mo | 0,90-1,10 | 0.900 | 1.100 | Range |
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: Ni.
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.
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.