ASTM A193 B8M Bolts

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The Mumbai, India-based Fasteners Mart is a leading producer and supplier of quality fasteners, including ASTM A193 B8M bolts. These bolts are produced from high-quality stainless steel, providing maximum strength, corrosion resistance, and performance in severe environments. Being high-pressure and high-temperature-capable, ASTM A193 B8M bolts are ideal for use in petrochemical, power generation, and marine engineering sectors. The Fasteners Mart is committed to delivering sound, customized fastening solutions with on-time delivery and superior customer service to meet the diverse needs of customers in a variety of industries.

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ASTM A193 B8M bolts are made from austenitic stainless steel containing 18-20% chromium and 8-10% nickel in dominant proportions, with the remainder iron and trace amounts of manganese, silicon, and carbon. The addition of 2.0-3.0% molybdenum provides enhanced crevice and pitting corrosion resistance. Mechanical properties include tensile strength 70-100 ksi (485-690 MPa) and yield strength not lower than 30 ksi (205 MPa). These bolts exhibit good ductility, toughness, and stress corrosion cracking resistance and are therefore best suited for severe environments in petrochemical, chemical, and marine applications.

ASTM A193 B8M Bolts Chemical Composition

Element	B7	B8	B8M
Carbon	0.37 – 0.49%	0.08% max	0.08% max
Manganese	0.65 – 1.10%	2.00% max	2.00% max
Phosphorus, max	0.035%	0.045%	0.045%
Sulfur, max	0.040%	0.030%	0.030%
Silicon	0.15 – 0.35%	1.00% max	1.00% max
Chromium	0.75 – 1.20%	18.0 – 20.0%	16.0 – 18.0%
Nickel		8.0 – 11.0%	10.0 – 14.0%
Molybdenum	0.15 – 0.25%		2.00 – 3.00%

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ASTM A193 B8M Bolts Mechanical Properties

Grade	Size	Tensile ksi, min	Yield, ksi, min	Elong, %, min	RA % min
B7	Up to 2-1/2	125	105	16	50
	2-5/8 – 4	115	95	16	50
	4-1/8 – 7	100	75	18	50
B8 Class 1	All	75	30	30	50
B8M Class 1	All	75	30	30	50
B8 Class 2	Up to 3/4	125	100	12	35
	7/8 – 1	115	80	15	35
	1-1/8 – 1-1/4	105	65	20	35
	1-3/8 – 1-1/2	100	50	28	45
B8M Class 2	Up to 3/4	110	95	15	45
	7/8 – 1	100	80	20	45
	1-1/8 – 1-1/4	95	65	25	45
	1-3/8 – 1-1/2	90	50	30	45

ASTM A193 B8M Bolts Specifications

Material	Specification	Standards	Size	Length
ASTM A193 B8M Bolt	IS BS ASTM	DIN, ISO, JIS, GB, IS, BS, ASTM	M 02 to M 160	3 mm to 200 mm

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ASTM A193 B8M bolts are used in high-strength, corrosion-resistant, and durability-critical applications in severe environments. They have good pitting, crevice corrosion, and high-temperature resistance, making them fit for petrochemical, chemical processing, power generation, and marine engineering applications. Common applications involve retaining parts in pressure vessels, heat exchangers, reactors, turbines, and piping systems. These bolts work under high pressure and high temperature, thus making them essential for machinery operating in harsh environments. ASTM A193 B8M bolts also find applications in aerospace, construction, and automotive sectors with continuous performance and lasting durability.

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Types of ASTM A193 B8M Bolts

ASTM A193 B8M bolts are carefully packaged to prevent damage during transportation and ensure safe transportation. They are normally packaged in heavy-duty cartons, moisture-proof packaging, or wooden crates to prevent corrosion and physical damage. Every batch is tested rigorously, including tensile strength, hardness, dimensional tolerance, and corrosion resistance, before shipment to guarantee ASTM standards compliance. Detailed certificates of compliance and test reports are provided, assuring customers that the bolts meet the required specifications for high-performance and critical industrial applications.