ASTM A193 Grade L7M Fasteners

Unifit Metalloys Inc offers many ASTM A193 Grade L7M fasteners. These are carefully made for sour gas H2S environments. They are also built for other tough environments. These conditions need controlled hardness, better flexibility and excellent notch toughness that is key for long life. These fasteners are made from chromium and molybdenum alloy steel. They are quenched and tempered very carefully. This ensures steady metal properties. It also ensures good structure. They follow strict rules of NACE, MR0175, ISO 15156. So L7M fasteners are good for service in sulfide stress cracking SSC areas. These areas are common in oilfields, offshore platforms and sour service pipelines.

Standard L7 grade is different. ASTM A193 Grade L7M fasteners are changed on purpose. Their tensile strength is kept below certain limits. Usually less than 100 ksi. This ensures a softer more flexible metal structure. This softer structure lowers the risks. Risks of hydrogen embrittlement and breaking suddenly. This makes L7M the best choice for wet H2S service, high pressure sour gas lines, subsea gear and pressure units in refineries. In these places safety is very important. Following global material standards is a must.

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Table of Content

ASTM A193 Grade L7M Fasteners Specification
Types Of ASTM A193 L7M Fasteners

ASTM A193 Gr. L7M Bolts
ASTM A193 Gr. L7M Screws
ASTM A193 Gr. L7M Stud Bolt

ASTM A193 Gr. L7M Fasteners Standards
Export Destinations For ASTM A193 L7M Fasteners

What is ASTM A193 Grade L7M?

ASTM A193 Grade L7M is a standard for alloy steel fasteners. These fasteners are made specially for low temperature and high pressure places. They are also suitable for sour gas and H2S service areas. These are areas where hydrogen embrittlement is a big worry. Sulfide stress cracking (SSC) is also a concern.

For industry, Grade L7M is a changed version of standard ASTM A193 Grade L7. The main difference is in controlled metal properties. Hardness and tensile strength are especially reduced. This controlled hardness meets NACE, MR0175, ISO 15156 standards. These standards are for materials used in wet H2S service.

L7M fasteners go through quenching and tempering. But their hardness cannot go over a certain point. Usually Rockwell C22 or less. This makes them softer. They are more flexible than standard L7 fasteners. This lower hardness is very important. It stops cracks from starting and growing in sour places. Cracks can risk safety and how well things work.

Industries like oil, gas, petrochemicals and offshore drilling use ASTM A193 Grade L7M fasteners a lot. They use them for their great toughness and their reliability in corrosive conditions.

Types of ASTM A193 L7M Fasteners

ASTM A193 Grade L7M fasteners come in many shapes. This is to fit different industrial needs. Especially in sour service conditions. These fasteners are made with exact hardness control. They have top material quality. This ensures safe and reliable performance.

ASTM A193 L7M Bolts

ASTM A193 L7M Structural Bolts
ASTM A193 L7M Heavy Hex Bolts
ASTM A193 L7M Hex Bolts
ASTM A193 L7M Hexagon Head Bolts
ASTM A193 L7M Machine Bolts
ASTM A193 Grade L7M T Bolts
ASTM A193 Gr. L7M Eye Bolt
ASTM A193 L7M Foundation Bolts
Alloy Steel A193 Gr L7M J Bolts
ASTM A193 L7M Button Head Bolt

ASTM A193 L7M Anchor Bolts
ASTM A193 L7M Long Bolts
ASTM A193 L7M Carriage Bolt
ASTM A193 L7M Elevator Bolt
ASTM A193 L7M Timber Bolts
ASTM A193 L7M Square Bolt
ASTM A193 L7M Metric Bolt
ASTM A193 L7M Plow Bolts
Alloy Steel Gr. L7M U Bolts
ASTM A193 L7M Flange Bolts

ASTM A193 L7M Screw

ASTM A193 L7M Socket Set Screw
ASTM A193 L7M Self Drilling Screw
ASTM A193 L7M Socket Head Cap Screw
ASTM A193 L7M Hex Head Screws
ASTM A193 L7M Wood Screw
ASTM A193 Gr. L7M Eye Screw
ASTM A193 Gr. L7M Wing Screw
ASTM A193 L7M Self Tapping Screws
ASTM A193 Gr. L7M Roofing Screw

ASTM A193 L7M Phillips Head Screw
ASTM A193 L7M Decking Screw
ASTM A193 L7M Machine Screw
ASTM A193 L7M Thumb Screw
ASTM A193 L7M Drywall Screws
ASTM A193 L7M Chipboard Screw
ASTM A193 L7M Metric Set Screws
Alloy Steel L7M Sems Screw
ASTM A193 L7M Thread Rolling Screw

ASTM A193 L7M Stud Bolt

ASTM A193 L7M Full Threaded Stud Bolts
ASTM A193 L7M Half Threaded Stud Bolts
Alloy Steel ASTM A193 L7M Threaded Rod
ASTM A193 L7M Double Ended Studs
ASTM A193 L7M Tap End Stud Bolt
Alloy Steel ASTM A193 L7M Tie Rods

Alloy Steel A193 Grade L7M Studs
ASTM A193 L7M Single End Stud Bolts
A193 Gr.L7M Reduced Shank Stud Bolt
L7M Continuous Threaded Stud Bolt
A193 L7M Partial Threads Stud Bolt
SA193 / A193 L7M Heavy Stud Bolts

All fasteners are available in standard sizes. They also come in custom sizes. These follow ASTM ASME DIN and ISO rules. This ensures they meet your project’s exact needs.

ASTM A193 Grade L7M Chemical Composition

ASTM A193 Grade L7M fasteners are made using alloy steel. This steel meets strict chemical mix standards. This ensures they work best in sour gas areas. Each element in the mix helps. It helps the material’s strength, flexibility and resistance to hydrogen embrittlement. This makes it right for NACE MR0175 ISO 15156 rules.

Element	Composition (%)
Carbon (C)	0.30 – 0.40
Manganese (Mn)	0.60 – 0.90
Phosphorus (P)	≤ 0.035
Sulfur (S)	≤ 0.040
Silicon (Si)	0.15 – 0.35
Chromium (Cr)	0.40 – 0.60
Molybdenum (Mo)	0.15 – 0.25

This carefully controlled chemical composition ensures the required mechanical properties and resistance needed for safe operation in sour gas and critical pressure applications.

ASTM A193 Grade L7M Raw Material

ASTM A193 Grade L7M fasteners are made from high quality alloy steel raw materials. These materials are chosen specially. They are chosen for their ability to work in sour gas H2S and low temperature places. These raw materials go through strict quality checks. This ensures they meet NACE MR0175 ISO 15156 rules. They also meet industry specific needs.

Grade	Raw Material Description
ASTM A193 L7M	Chromium-Molybdenum-Vanadium Alloy Steel, Quenched & Tempered

Using certified traceable and heat treated alloy steel ensures long life. It ensures flexibility. It also ensures resistance to hydrogen embrittlement in key jobs.

ASTM A193 Grade L7M Material Specification for Fasteners

ASTM A193 Grade L7M material specifications are specially prepared. They ensure lower hardness. They also ensure better toughness. This makes them perfect for sour service environments.

Specifications : ASTM A193 / ASME SA193
Length : 3mm to 200mm
Size : 3/6″ to 2″, M3 – M56, Custom Sizes

ASTM A193 Grade L7M Mechanical Properties of Fasteners

ASTM A193 Grade L7M fasteners are made specially. They keep their metal strength in sour service conditions. These fasteners have lower tensile strength. They also have controlled hardness. This lessens the risk of cracking from hydrogen.

Property	Requirement
Tensile Strength	100 ksi (690 MPa) max
Yield Strength	80 ksi (550 MPa) min
Elongation (min)	20% in 4D
Reduction of Area (min)	50%
Hardness	235 HB max (Brinell), 99 HRB max
Impact Energy (Charpy V-Notch)	20 ft-lbf (27 J) min at -50°F (-46°C)

These mechanical properties ensure ASTM A193 L7M fasteners provide reliable performance in critical sour gas environments and comply with NACE MR0175/ISO 15156 standards.

Comparison Chart: L7M vs Other Grades

When picking fasteners for important jobs, understanding key differences is vital. The differences are between ASTM, A193 Grade L7M, A193 Gr L7 and A193 Gr B7 fasteners. This comparison shows important features. Features like hydrogen sulfide resistance hardness limits and rule compliance. This helps you make a smart choice for your project needs.

Feature	L7M	L7	B7
H₂S Resistance	Excellent	Not Suitable	Not Suitable
Max Hardness	235 HB	321 HB	321 HB
Application	Sour Service	Low Temp	High Temp
NACE Compliant	Yes	No	No

ASTM A193 Grade L7M Fasteners Standards

ASTM A193 Grade L7M fasteners are manufactured and tested in accordance with stringent industry standards to ensure superior performance in sour service and low-temperature environments.

Hexagon Bolt / Set Screws	Stud Bolt	Hexagon Nuts	Socket Cap screws
DIN 931	BS4882	DIN 934	DIN 912
DIN 933	DIN 976	BS 1768	DIN 6912
BS 1768		BS 1769	DIN 7984
UNI 5731		BS 1083	ANSI B18.3
UNI 5739		BS 3692	ISO 4762
ISO 4014		ISO 4032	UNI 5931
ISO 4017		ISO 4033	BS 2470
BS 1769		ANSI B18.2.2	BS 4168
BS 3692
ANSI B18.2.1

Socket & Slotted Set Screws	Socket & Slotted Countersunk Screws	Studs	Washers
DIN 913	DIN 963	DIN 938	DIN 125
DIN 914	DIN 7991	DIN 939	DIN 9021

Why Choose ASTM A193 Grade L7M Fasteners for Sour Service Applications?

ASTM A193 Grade L7M fasteners are made uniquely. They handle tough conditions in sour gas and hydrogen sulfide places. Their controlled tensile strength and better flexibility lower the risk of cracking caused by hydrogen. This makes them much better than standard alloy fasteners in these key jobs. This special performance ensures the strength and safety of high pressure gear like pipelines, valves and pressure vessels. These are used in oil and gas refining and offshore platforms. By choosing ASTM A193 L7M fasteners from Unifit Metalloys Inc., you get reliable rust resistant fastening solutions. These solutions make equipment last longer. They also cut repair costs in sour service conditions.

Applications of ASTM A193 Grade L7M Fasteners

ASTM A193 Grade L7M fasteners are precision made. They work very well in very corrosive sour gas H2S environments. They also work well in low temperature and high pressure jobs. These jobs need controlled hardness and amazing toughness. These fasteners are used a lot across important sectors like:

Heavy Engineering Industries
Petro-Chemical Industries
Shipbuilding Industries
Fertilizer Plants
Civil Construction Industries
Power Generation Units (Nuclear, Hydro, or Thermal)
Civil Industries
Oil Expansion Projects
Offshore & Onshore Oil Towers
Valves
Pressure Vessels
Home Fittings
Pumps
Railways
Steel Plants

ASTM A193 Grade L7M Price in India for Fasteners

Unifit Metalloys Inc. offers great value on ASTM A193 Grade L7M fasteners in India. We deliver top quality products. They are made for sour gas environments as well as for important low temperature jobs. Whether you need L7M hex bolts, studs or heavy hex nuts, our fasteners are made precisely. They meet strict industry standards. This ensures long life, controlled hardness and amazing resistance to hydrogen embrittlement. We promise quick delivery and expert help. We are your trusted partner for reliable high performance alloy fastener solutions. These solutions keep your projects safe and working well.

To start with your ASTM A193 Grade L7M fastener needs or ask for a personal price quote, please fill the form below. Our skilled team is ready to give custom solutions and quick assistance.

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Unifit Metalloys Inc. manufactures, suppliers and exports of ASTM A193 Grade L7M Fasteners to various countries such as Portugal, Belarus, Poland, Croatia, New Zealand, Turkey, Vietnam, Denmark, Trinidad & Tobago, Chile, Argentina, Oman, Jordan, Colombia, Egypt, Algeria, Tunisia, Bhutan, Chile, Ecuador, Bangladesh, Russia, Nigeria, Costa Rica, Singapore, China, Kazakhstan, Lebanon, Kuwait, Finland, United Arab Emirates, Venezuela, Romania, Italy, Iran, Japan, Lithuania, Mongolia, United States, Gabon, Morocco, Mexico, Brazil, United Kingdom, Bolivia, Angola, Ghana, Libya, Ukraine, Hungary, Jordan, Saudi Arabia, Poland, Hong Kong, Australia, Greece, Mexico, Qatar, Philippines, Czech Republic, South Africa, Indonesia, Peru, Taiwan, Bahrain, France, Thailand, Spain, Israel, Canada, Belgium, Afghanistan, Iran, Sri Lanka, Yemen, Switzerland, Estonia, Iraq, Serbia, Kazakhstan, Austria, Slovakia, Nigeria, Australia, Pakistan, Norway, Malaysia, Netherlands, Azerbaijan, Sweden, South Korea, Kenya, Bulgaria.