ASTM A193 Grade B7m Bolts and Studs

• Material: High Strength Steel
• Type: Round Head
• Connection: Common Bolt
• Head Style: Round
• Standard: DIN, ANSI, GB, JIS, BSW, GOST
• Grade: B7.B7m,B16
• Model NO.: ASTM A193 Grade B7M
• Application: Machinery, Chemical Industry, Environmental, Building
• Finish: Black
• Do You Have Factory: Yes
• MOQ: 10PCS Per Size
• Transport Package: Wooden Pallets
• Specification: 1/2"-4"
• Trademark: Laiwu Xincheng
• Origin: China
• HS Code: 73181900
• Production Capacity: 3000tons/Month

Product Description

ASTM A193 Grade B7M bolts and studs

ASTM A193 Grade B7M bolts and studs are identical in chemistry to Grade B7 (quenched and tempered medium carbon alloy steel), but have lower strength requirements and require 100% hardness testing of all fasteners manufactured in the lot. Grade B7M bolts resist chloride, sulfide, and hydrogen stress corrosion cracking (SCC) and are frequently used in sour gas service.

Our main grades for threaded ros:
ASTM A193: B7, B7M, B16, B8 class 1, B8 class 2, B8M class 1, B8M class 2, B8T etc.
ASTM A320: L7, L7M, L43, B8 class 1, B8 class 2, B8M class 1, B8M class 2, B8T etc.

Our supplied sizes:1/2"-4"

Surface finish: Self black, Blacken,Zinc-coated, GI and so on


Property in A193 B7 and B7M

Grade	Sizes	Tensile ksi, min	Yield, ksi, min	Elong, %, min	RA % min	HBW	HRC
A193 B7	Up to 2-1/2	125	105	16	50	321 max	35 max
	2-5/8 - 4	115	95	16	50
	4-1/8 - 6	100	75	18	50

Grade	Diameter	Tensile ksi, min	Yield, ksi, min	Elong, %, min	RA % min	HBW	HRC
B7M	Up to 4	100	80	18	50	235 max	-
	Over 4 - 7	100	75	18	50

Steel materials 4140 chemical composition

Element	B7 /B7M (AISI 4140)
Carbon	0.38 - 0.48%
Manganese	0.75 - 1.00%
Phosphorus, max	0.04%
Sulfur, max	0.04%
Silicon	0.15 - 0.35%
Chromium	0.80 - 1.10%
Nickel
Molybdenum	0.15 - 0.25%