ASTM A 194 - 2000-螺栓和螺母用碳钢、合金钢和不锈钢材料- 易紧通

Scope

The ASTM A194 specification covers carbon, alloy and stainless steel nuts intended for use in high-pressure and/or high-temperature service. Unless otherwise specified, the American National Standard Heavy Hex Series (ANSI B 18.2.2) shall be used. Nuts up to and including 1 inch nominal size shall be UNC Series Class  2B fit. Nuts over 1 inch nominal size shall be either UNC Series Class 2B fit or 8 UN Series Class 2B fit. High strength ASTM A194 grade 2H nuts are common in the marketplace and are often substituted for ASTM A563 grade DH nuts due to the limited availability of DH nuts in certain diameters and finishes.

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

Grade	Size	Tensile, ksi, min	Yield, ksi, min	Charpy Impact 20-ft-lbf @ temp	Elong, %, min	RA, %, min
L7	Up to 2¹/₂	125	105	-150° F	16	50
L43	Up to 4	125	105	-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	35
	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	95	65	N/A	25	45
	1³/₈ - 1¹/₂	90	50	N/A	30	45

Recommended Nuts and Washers

Grade	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
B8M Class 2	A194 Grade 8M, strain hardened	SS316

螺栓和螺母用碳钢、合金钢和不锈钢材料 ASTM A 194 - 2000

Scope

Grades

Mechanical Properties

Recommended Nuts and Washers