ASTM A420

ASTM A420：美国材料试验学会
低温使用的锻制碳钢和合金钢管道配件

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ASTM A420：美国材料试验学会
低温使用的锻制碳钢和合金钢管道配件

拉伸要求
需求	Grade
	WPL6		WPL9		WPL3		WPL8
抗拉强度，min ksi [MPa]	60 [415] − 85 [585]		63 [435] − 88 [610]		65 [450] − 90 [620]		100 [690] − 125 [865]
屈服强度，min ksi [MPa]	35 [240]		46 [315]		35 [240]		75 [515]
伸长率要求	Grade
	WPL6		WPL9		WPL3		WPL8
	纵	横	纵	横	纵	横	纵	横
标准圆形试样或小比例试样，4 d内最小％	22	12	20	...	22	14	16	...
壁厚为5/16英寸（7.94毫米）及以上的矩形试样，适用于全截面试验的所有小尺寸; 最小％in 2 in。或50毫米	30	16.5	28	18	30	20	22	...

壁厚小于5/16英寸[7.94毫米]的矩形试样; 最小％in 2 in。或50 mm（1/2 in。[12.7-mm]宽样品）	A	A	A	A	A	A	A	...
A对于每个1/32英寸[0.79毫米]降低厚度，低于5/16英寸[7.94毫米]，扣除1.5％（等级WPL6，WPL9和WPL3）或1.25％（WPL8）纵向和1.0％（等级WPL6，WPL9和WPL3）允许横向从上面显示的值。下表给出了各种壁厚的最小值：

化学要求
A级	成分 %
A级	C	锰	磷	硫	硅	镍	铬	钼	铜	炭黑	钒
WPL6	0.30	1.50-1.35	0.035	0.04	0.15-0.40	0.40	0.3	0.12	0.40	0.02^B	0.08
WPL9	0.20	0.40-1.06	0.030	0.03	...	1.60-2.24			0.75-1.25
WPL3 C	0.20	0.31-0.64	0.05	0.05	0.13-0.37	3.2-3.8			...
WPL8 D	0.13	0.90	0.30	0.03	0.13-0.37	8.4-9.6			...
A When fittings are of welded construction, the symbols above shall be supplemented by the letter"W".
B By agreement,the limit for Columbium may be increased up to 0.05% on heat analysis and 0.06% on product analysis.
C Fittings made from plate or forgings may have 0.90% max manganese.
D Fittings made from plate may have 0.98% maxmanganese.

Available Dimension Range

OD(mm/inch)

Wall thickness(SCH)

STD

100

120

140

160

XXS

21.3 (1/2'')

26.7 (3/4'')

33.4 (1'')

42.2 (1 1/4'')

48.3 (1 1/2'')

60.3 (2'')

73 (2 1/2'')

88.9 (3'')

101.6 (3 1/2'')

114.3 (4'')

141.3 (5'')

168.3 (6'')

219.1 (8'')

273 (10'')

323.8 (12'')

355.6 (14'')

406.4 (16'')

457 (18'')

508 (20'')

559 (22'')

610 (24'')

*If the steel grades and size you are looking for are not listed above, please contact us for further information.

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