DH36
Data verifiedDH36 is the −20 °C impact version of the 355 MPa hull grade, specified for vessels trading in cold waters and for exposed structure where AH36 toughness is insufficient. Chemistry is the same family as AH36; the difference is the toughness guarantee and its verification.
Chemical composition
| Element | Content (%) |
|---|---|
| C | ≤0.18 |
| Si | ≤0.50 |
| Mn | 0.90–1.60 |
| P | ≤0.035 |
| S | ≤0.035 |
| Note | Nb/V/Ti grain-refining per class rules |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Yield strength | ≥355 MPa |
| Tensile strength | 490–630 MPa |
| Impact | −20 °C, ≥34 J longitudinal (≤50 mm) |
| Density | 7.85 g/cm³ |
Heat treatment
Supplied normalized or TMCP under class survey.
Equivalent grades
| Standard | Designation |
|---|---|
| aisi | A131 DH36 |
| jis | KD36 (near) |
| gb | DH36 (GB/T 712) |
Compare side by side: DH36 vs EH36 · DH36 vs AH36
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Hull structure for cold-region trades, ice-class vessels (with class notation), offshore units.
Processing: As AH36; check the impact temperature on the class certificate, not the grade name alone.
FAQ
- AH36, DH36, EH36 — what changes?
- Strength is identical (355 MPa, 490–630 MPa). Only the impact-test temperature steps down: A = 0 °C, D = −20 °C, E = −40 °C.
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Ask for a quotationVisit NasteelSource: ASTM A131 / class rules published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.