ASTM A240 ASME SA240 Stainless Steel Plate Specification

What is ASTM A240?

ASTM A240 is a standard specification for chromium and chromium-nickel stainless steel plate, sheet, and strip for pressure vessels and general applications. This specification covers various grades of stainless steel commonly used to manufacture heat exchangers, chemical tanks, and other pressure vessels. This standard is widely used in the US and is recognized globally.

What is ASME SA240?

ASME SA240 is almost identical to ASTM A240 in terms of its specifications. The only difference is that ASME SA 240 is developed and maintained by the American Society of Mechanical Engineers (ASME) and is used primarily for pressure vessel applications. So, while ASTM A240 is used for pressure vessels and general applications, ASME SA 240 focuses on the former.

ASTM A240 Plate Specification

ASTM A240 stainless steel plate sheet contains alloys ranging from 304, 304L, 316, 316L, 316Ti, 316L Mod, 17-4ph, 310, 310S, 317, 317L, 321, 321H, 347, 347H, 904L, 254SMO, 253MA, S32550, S32205, S31803, 2507, S31050, S30815, and so on. ASTM A240 stainless steel plate has corrosion resistance and can be used for a long time in a humid and corrosive environment. ASTM A240 stainless steel sheet also has high strength, heat resistance, easy processing, and good appearance properties. The surface finish of Stainless steel plate can be No.1, 2B, No.4, BA, 8K mirror, or customized.

ASTM A240 ASME SA240 Sizes And Dimensions

Description	ASTM A240 / ASME SA240 Stainless Steel Plates, ASTM A240 Hot Rolled Stainless Steel Plates
Thickness	0.25-200mm, 0.3mm to 120mm
Width	1000mm, 1219mm, 1500mm, 1800mm, 2000mm, 2500mm, 3000mm, 3500mm
Length	2000mm, 2440mm, 3000mm, 5800mm, 6000mm, 12000mm

1. ASTM A240 Hot Rolled Sheet/coil Thickness Tolerance

Thickness,in.[mm]	Deviation, allowed for the specified width
	-
	(w),±,in.[mm]
	w≤60[1525]	w＞60[1525]
0.072[1.83]	0.006[0.15]	0.009[0.22]
＞0.072[1.83]-0.083[2.11]	0.007[0.18]	0.010[0.25]
＞0.083[2.11]-0.098[2.49]	0.008[0.20]	0.011[0.27]
＞0.098[2.49]-0.114[2.90]	0.009[0.23]	0.012[0.30]
＞0.114[2.90]-0.130[3.30]	0.011[0.27]	0.013[0.33]
＞0.130[3.30]-0.145[3.68]	0.012[0.30]	0.013[0.33]
＞0.145[3.68]-0.1875[4.76]	0.013[0.33]	0.014[0.35]
＞0.1875[4.76]-0.250[6.35]	-0.010[0.25],+0.020[0.50]	-0.010[0.25],+0.020[0.50]
＞0.250[6.35]-0.3125[7.94]	-0.010[0.25],+0.022[0.55]	-0.010[0.25],+0.022[0.55]
＞0.3125[7.94]	-0.010[0.25],+0.030[0.75]	-0.010[0.25],+0.030[0.75]

2. ASTM A240 Cold Rolled Sheet/plate Thickness Tolerance

Thickness ,in.[mm]	Deviation, allowed for the specified width
	-
	(w),±,in.[mm]
	W≤40[1000]	40[1000]＜w≤50[1300]	50[1300]＜w≤84[2100]
0.012[0.30]	0.001[0.030]	-	-
0.016[0.40]	0.0015[0.04]	0.0015[0.04]	-
0.020[0.50]	0.0015[0.04]	0.0015[0.04]	-
0.024[0.60]	0.002[0.05]	0.002[0.05]	-
0.032[0.80]	0.002[0.05]	0.002[0.05]	-
0.040[1.00]	0.0025[0.06]	0.0025[0.06]	0.003[0.08]
0.047[1.20]	0.003[0.08]	0.003[0.08]	0.003[0.08]
0.059[1.50]	0.003[0.08]	0.003[0.08]	0.004[0.10]
0.079[2.00]	0.004[0.10]	0.004[0.10]	0.0045[0.11]
0.098[2.50]	0.004[0.10]	0.004[0.10]	0.005[0.13]
0.118[3.00]	0.005[0.13]	0.005[0.13]	0.006[0.15]
0.157[4.00]	0.007[0.17]	0.007[0.17]	0.007[0.17]
0.197[5.00]	0.007[0.17]	0.007[0.17]	0.0075[0.19]
0.236[6.00]	0.007[0.17]	0.008[0.20]	0.009[0.23]
0.3125[8.00]	0.007[0.17]	0.009[0.23]	0.010[0.25]

3. ASTM A240 Hot Rolld Plate With Greater Width

Thickness (t),in.[mm]	width(w),in.[mm]
	w≤84[2134]	84[2134]＜w≤120[3048]	120[3048]＜w≤144[3658]	w＞144[3658]
	^{thickness + C},in.[mm]
t＜3/16[4.76]	0.055[1.35]	0.070[1.78]	-	-
3/16[4.76]≤t＜3/8[9.52]	0.045[1.14]	0.050[1.27]	0.085[2.16]	-
3/8[9.52]≤t＜3/4[19.05]	0.055[1.40]	0.060[1.52]	0.085[2.16]	0.090[2.29]
3/4[19.05]≤t＜1[25.40]	0.060[1.52]	0.065[1.65]	0.085[2.16]	0.100[2.54]
1[25.40]≤t＜2[50.80]	0.070[1.78]	0.075[1.90]	0.095[2.41]	0.115[2.92]
2[50.80]≤t＜3[76.20]	0.125[3.20]	0.150[3.80]	0.175[4.45]	0.200[5.08]
3[76.20]≤t＜4[101.6]	0.150[3.81]	0.160[4.06]	0.200[5.08]	0.225[5.72]
4[101.6]≤t＜6[152.4]	0.180[4.57]	0.200[5.08]	0.335[8.50]	0.355[9.02]
6[152.4]≤t＜8[203.2]	0.235[6.00]	0.255[6.48]	0.355[9.02]	0.435[11.0]
8[203.2]≤t＜10[254.0]	0.315[8.00]	0.335[8.50]	0.435[11.0]	0.550[14.0]

ASTM A240 Stainless Steel Plate Manufacturing Process

Material Selection: The first step in manufacturing stainless steel plates is to select the appropriate raw materials. According to the requirements of ASTM A240, different grades and categories of stainless steel have specific chemical compositions and mechanical properties. Manufacturers need to ensure that the selected stainless steel meets the requirements of the standard specifications.

Smelting: Selected stainless steel raw materials undergo a smelting process to obtain a specific alloy composition. Control at this stage is crucial to ensure the quality of stainless steel plates.

Hot rolling: The smelted stainless steel block is heated to the appropriate temperature and then shaped through the hot rolling process. This step produces sheets of required size and thickness.

Surface Treatment: Stainless steel panels may require surface treatment to achieve a specific surface finish or texture. This may include pickling, polishing or other special treatments.

Cold rolling: In some cases, ASTM A240 hot-rolled stainless steel plates may need to be cold-rolled to improve surface quality and flatness.

Heat Treatment: If necessary, stainless steel plates may undergo heat treatment to adjust their mechanical properties. This can include quenching, tempering or other heat treatments.

Cutting and Trimming: The stainless steel panels are ultimately cut and trimmed according to the customer's specifications to meet the project's specific size and shape requirements.

Inspection and testing: Strict quality control will be carried out during the manufacturing process, including chemical composition analysis, mechanical performance testing, surface inspection, etc. This ensures that the stainless steel plate meets the requirements of the ASTM A240 standard.