SA203E is a fine-grain killed steel, a kind of low temperature pressure vessel steel plate. SA203E corresponds to the Chinese grade 08Ni3DR, commonly known as 3.5Ni steel. SA203E and 08Ni3DR steels have good impact toughness and mechanical properties under low temperature conditions. SA203E and 08Ni3DR steel are usually used in a low temperature environment of -70 to -101℃ (the quenched and tempered state can reach -107℃).
Delivery status of SA203E and 08Ni3DR steel: normalized + tempered, quenched and tempered.
SA203E, 3.5Ni steel product melting analysis, chemical elements
| Thickness | C | Si | Mn | P | S | Ni | |||
| Melt Analysis | Finished Product Analysis | Melt Analysis | Finished Product Analysis | Melt Analysis | Finished Product Analysis | ||||
| ≤50 | ≤0.20 | 0.15-0.40 | 0.13-0.45 | ≤0.70 | ≤0.78 | ≤0.015 | ≤0.015 | 3.25-3.75 | 3.18-3.82 |
| ＞50-100 | ≤0.23 | ≤0.80 | ≤0.88 | ≤0.015 | ≤0.015 | ||||
*CE(%)=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 (measured value provided). To improve the properties of the steel plate, trace alloying elements can be added.
08Ni3DR steel chemical composition:
| C | Si | Mn | P | S | Ni | Mo | V |
| ≤0.1 | 0.15-0.35 | 0.3-0.8 | ≤0.015 | ≤0.005 | 3.25-3.7 | ≤0.12 | ≤0.05 |
Mechanical properties of SA203E, 3.5Ni steel:
| Rp0.2 MPa | Rm MPa | A50 % | Surface Hardness HB | Cold Bending 180° | -101℃AKV，J，Transverse | ||||||
| Average of three samples | Single value | ||||||||||
| ≥275 | 485-620 | ≥21 | ≤220 | d=3a Intact |
≥27 | ≥20 | |||||
08Ni3DR steel mechanical properties:
| Yield Strength | Tensile Strength | Elongation at Break | Bending Diameter | Impact Temperature | Minimum Impact Energy |
| ≥300Mpa | 480-610 Mpa | ≥21% | d=3a | -104 | 48J |
SA203E and 08Ni3DR steel are widely used in the manufacture of equipment in the fields of cryogenic separation processing, air separation and liquefied gas storage. SA203E and 08Ni3DR steel are used in CO2 absorption towers, H2S absorption towers, H2S concentration towers, methanol washing towers and other low temperature equipment in coal chemical projects.
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