SA203 GrE steel corresponds to the Chinese standard 08Ni3DR

SA203 GrE corresponds to the Chinese standard 08Ni3DR. It is a fine grain killed steel, a steel plate for low temperature pressure vessels, commonly known as 3.5Ni steel. SA203 GrE steel, i.e. 08Ni3DR steel, has good impact toughness and mechanical properties under low temperature working conditions, It is usually used in the low temperature environment of - 70 ~ - 101 ℃ (the quenched and tempered state can reach - 107℃). It is widely used in the manufacturing of equipment in the fields of cryogenic separation and processing, air separation and liquefied gas storage.

In recent years, SA203 GrE material is widely used in low temperature equipment such as CO2 absorber, H2S absorber, H2S concentration tower and methanol scrubber in domestic coal chemical projects. The maximum thickness of SA203 GrE (08Ni3DR) steel plate currently used is 110mm.

Melting analysis of chemical composition of SA203 GrE and 08Ni3DR steel plates:

Thickness	C	Si		Mn		P	S	Ni
		Melting analysis	Finished product analysis	Melting analysis	Finished product analysis			Melting 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

Note: * CE (%) = C + Mn / 6 + (Cr + Mo + V) / 5 + (Ni + Cu) / 15 (provide measured value). In order to improve the performance of steel plate, trace alloy elements can be added.

Mechanical properties of SA203 GrE and 08Ni3DR steel plates:

Rp0.2	Rm	A50	Surface hardness HB	Cold bending 180°	-101℃AKV，J，transverse
MPa	MPa	%			Average of three samples	Single value
≥275	485-620	≥21	≤220	d=3a intact	≥27	≥20

Heat treatment delivery status of SA203 GrE and 08Ni3DR steel plates:
SA203 GrE (08Ni3DR) steel plate shall be delivered in the state of normalizing + tempering.