螺栓材料A320 Gr.L7介绍

更新时间:2023-07-24 04:45:24 阅读：评论：0

ASTM A320

Scope

Originally approved in 1948, the ASTM A320 specification covers alloy steel and stainless steel bolting materials for low temperature rvice. This standard covers rolled, forged, or strain hardened bars, bolts, screws, studs, and stud bolts ud for pressure vesls, valves, flanges, and fittings. Like the ASTM A193 specification, unless otherwi specified, the 8UN thread ries is specified on fastener larger than 1” in diameter.

Below is a basic summary of a few of the common grades within the ASTM A320 specification. A number of other less common grades of ASTM A320 exist, but not covered in the description below.

Grades

L7 Alloy steel	AISI 4140/4142 Quenched and tempered
L43 Alloy steel	AISI 4340 Quenched and tempered
B8 Class 1 Stainless steel	AISI 304, carbide solution treated
B8M Class 1 Stainless steel	AISI 316, carbide solution treated
B8 Class 2 Stainless steel	AISI 304, carbide solution treated, strain hardened
B8M Class 2 Stainless steel	AISI 316, carbide solution treated, strain hardened

Mechanical Properties

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Grade	Size	Tensile, ksi, min	Yield, ksi, min	Charpy Impact中华人民共和国民事诉讼法 20-ft-lbf @ temp	Elong, 泡泡少儿英语怎么样%, min	RA, %, min
L7	Up to 21/2	125	105	-150° F	16	50
L43	Up to 4	125	105	歌舞青春2下载-150° F	16	50
B8 Class 1	All	75	30	N/A	30	50
B8M Class 1	All	75	30	N/A	30	50
B8 Class 2	Up to 3/4	125	100	N/A	12	improve35
	7/8 - 1	115	80	N/A	15	35
	11/8 - 11/4	105	65	N/A	20	35
	13/8 - 11/2	100	50	N/A	28	45
B8M Class 2	Up to 3/4	110	95	N/A	15	45
	7/8 - 1	100	80	N/A	20	45
	11/8 - 11/4	nobler 95	65	N/A	25	45
	13/8 - 11/2	90	50 英语48个音标发音	N/A	30	45

Recommended Nuts and Washers

Grade	avoid用法Nuts	Washers
L7	A194 Grade 4 or 7	F436
L43	A194 Grade 4 or 7	F436
B8 Class 1	A194 Grade 8	SS304
B8M Class 1	A194 Grade 8M	SS316
B8 Class 2	A194 Grade 8, strain hardened	SS304 marryme是什么意思
上海出国留学中介B8M Class 2	A194 Grade 8M, strain hardened	SS316

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