3.5Ni, 08Ni3DR, SA203GrD, SA203GrE, SA203GrF, pressure vessel steel plate

SA203GrE steel plate

1. Analysis of 3.5Ni steel material

3.5Ni low temperature pressure vessel nickel alloy steel plate, 3.5Ni ship and marine engineering low-temperature toughness steel plate, 08Ni3DR low temperature pressure vessel steel plate, SA203GrD, SA203GrE, and SA203GrF American standard pressure vessel nickel alloy steel plate are all made of 3.5Ni steel, which is a low-temperature environment steel with a nickel content of about 3.5%.

2. 3.5Ni steel execution standard:

Executive standard for nickel alloy steel plates for 3.5Ni low-temperature pressure vessels: GB/T 24510 (this standard applies to nickel alloy steel plates with a thickness not exceeding 150mm for liquefied gas storage and transportation devices)

3.5Ni low-temperature toughness steel for ships and marine engineering execution standard: GB/T37602-2019 (This standard is applicable to carbon manganese low-temperature steel and nickel series low-temperature steel for liquefied gas transport ships, polar ships, and low-temperature marine engineering, and is suitable for steel plates with a thickness not exceeding 60mm)

The execution standard for steel plates used in 08Ni3DR low-temperature pressure vessels is GB 3531-2014 (this standard applies to steel plates with a thickness of 5mm~120mm used in the manufacturing of low-temperature pressure vessels at -196 ℃~-20 ℃)

SA203GrD, SA203GrE, SA203GrF American standard nickel alloy steel plates for pressure vessels shall comply with ASME SA203/SA203M (the nickel alloy steel plates in this standard are mainly suitable for welding pressure vessels, and the upper limit thickness of this grade of steel plate is 100mm)

3. Delivery status of 3.5Ni steel:

1> Nickel alloy steel plates for 3.5Ni low-temperature pressure vessels should be delivered in a quenched and tempered state. With the consent of the purchaser, steel plates with a thickness not exceeding 12mm can also be delivered in a normalized, normalized, and tempered state

2> 3.5Ni low-temperature toughness steel for ships and marine engineering can be delivered in the state of thermal mechanical rolling (TMCP), normalizing, normalizing+tempering, or quenching+tempering

3> Steel plates for 08Ni3DR low-temperature pressure vessels shall be delivered in the normalized or normalized+tempered state, or in the quenched+tempered state, and the tempering temperature shall not be lower than 600 ℃

4> The nickel alloy steel plate for SA203GrD American standard pressure vessels should be delivered in a normalized state. With the consent of the purchaser, in order to improve the toughness of the steel, it can also be delivered in a quenched and tempered state, and the tempering temperature should not be lower than 595 ℃

4. Chemical composition of 3.5Ni

Steel Grade

Als

3.5Ni Bolier

≤0.12

0.10~0.35

0.30~0.80

3.25~3.75

≤0.12

≤0.05

≤0.015

≤0.005

≤0.25

≤0.35

≤0.08

≥0.015

3.5Ni Ship

≤0.12

0.10~0.35

0.30~0.80

3.20~3.80

≤0.08

≤0.025

≤0.020

≤0.25

≤0.35

≤0.012

≥0.020

08Ni3DR

≤0.10

0.10~0.35

0.30~0.80

3.25~3.70

≤0.12

≤0.05

≤0.015

≤0.005

≤0.25

Nb+V+Ti≤0.12

SA203GrD

≤0.17

0.15~0.40

≤0.70

3.25~3.75

≤0.025

SA203GrE

≤0.20

0.15~0.40

≤0.70

3.25~3.75

≤0.025

SA203GrF

≤0.20

0.15~0.40

≤0.70

3.25~3.75

≤0.025

附：表中SA203GrD、E、F表中所列成分都是钢板厚度在50mm及以下的成分，50mm以上时，SA203GrD中C≤0.20，Mn≤0.80，SA203GrE、F中C≤0.23，Mn≤0.80

5、3.5Ni Mechanical Property

3.5Ni pressure vessel

Steel Grade	Thickness mm	Tensile test			Charpy V
		Tensile Strength Rm（MPa）	Yield Strength MPa	Elongation A%	°C	Impact,KK（J）


			≥			≥
3.5Ni Bolier	≤30	490~640	355	22	-100	80
	>30~50		345
	>50~100		335
	>100~150		325

SA203GrD，SA203GrE，SA203GrF Mechanical properties of nickel alloy steel plates for American standard pressure vessels

Steel Grade	Thickness mm	Tensile Strength Mpa	Yield Strength MPa	200mm Elongation %	50mm Elongation %
SA203GrD	≤50	450-585	≥255	≥19%	≥23%
SA203GrD	>50	450~585	≥255	≥19%	≥23%
SA203GrE	≤50	485-620	≥275	≥17%	≥21%
SA203GrE	>50	485~620	≥275	≥17%	≥21%
SA203GrF	≤50	550-690	≥380	~	≥20%
SA203GrF	>50	515~655	≥345	~	≥20%

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