ASTM A193 Grade B7 Toutes les tiges filetées (2023)

FAQs

What is ASTM A193 B7 equivalent material? ›

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.

ASTM A193 Grade B7 is a standard specification for high tensile alloy steel bolting material for use in high temperature or high-pressure service and other special purpose applications. It covers material specification for bolting used in pressure vessel service, valves, flanges and fittings.

ASTM A193 Grade B8T

Same as type 321 Stainless Steel.

A193 Grades

Class 1 Stainless steel, AISI 304, carbide solution treated.

B7. This chromium molybdenum steel has similar strength to SAE grade 5 fasteners, however, it is specifically used in high temperature and pressure applications. This grade is for fittings, flanges, valves, and pressure vessels. It is also used as threaded rod in concrete and epoxy.

Grade B7 is a heat-treated chromium-molybdenum low-alloy steel with minimum tensile strength requirement of 125 ksi (860 Mpa), yield 105 ksi (720 Mpa), and maximum hardness of 35HRC. Boltport uses Alloy Steel AISI 4140 bar stock or forging stock to produce B7 headed and non-headed bolts.

Alloy Steel Quenched & Tempered Threaded Rods (AISI 4140/4142) The ASTM A193-B7 (Grade B7), is the specification for a heat-treated chrome-moly steel used for medium high temperature service. Rods that meet this specification are either made from AISI 4140 or 4142.

What is the difference between A193 Grade B7 and SA193 Grade B7? A193 is an ASTM (American Society for Testing and Materials) specification, whereas SA193 is from ASME (American Society of Mechanical Engineers). ASME repurposed the ASTM specification and added an “S”. The primary difference is the application.

Metline is a full line manufacturer of A193 Gr B7 bolts and A194 Gr 2H nuts in a wide range of sizes and specifications. ASTM A193 B7 Bolts are considered most suitable for use in temperature below 450 ° C, with a minimum effect on its structural strength during application at a high temperature.

Is ASTM A193 Grade B7 weldable? ›

No they cannot. A193 Grade B7 bolts are manufactured from a medium carbon alloy steel that undergoes a heat treating process to develop its strength. When you apply heat during a welding operation, you run the risk of altering the mechanical properties (strength) of the bolt.

A193 B7 Cadmium Plated Stud Bolts are made with alloy steel for high temperature service. ASTM standard covers alloy steel and stainless steel bolting materials; this specification includes fasteners intended for use in pressure vessels, valves, flanges, and fittings.

ASTM A193 Grade B7

This grade of all thread is designed for high temperature or high pressure applications and intended for use in flanges, valves, pressure vessels and fittings. It is important to note that in this specification, the threading standard for rods above 1” in diameter is 8 threads per inch (tpi).

ASTM A193 Grade B7 heavy hex head bolts are high strength fasteners manufactured from heat treated alloy steel AISI 4140/4142, quenched and tempered. Dimensional specifications are governed by ASME B18. 2.1. Grade markings consists of both the grade symbol "B7" and the manufacturer's identification mark.

The seventh grade is typically the second or third year of middle school. Children in seventh grade are around 12–13 years old.

With a minimum tensile strength of 150 ksi and a minimum yield of 130 ksi, Grade 8 has a higher tensile and yield strength than other steel grades such as Grade 5 and B7. It is also quenched and tempered at 800 F leading to its strength.

Chemical Composition for ASTM A193 Grade B7

[90 mm], inclusive, the carbon content may be 0.50 %, max. For the B7M grade, a minimum carbon content of 0.28 % is permitted, provided that the required tensile properties are met in the section sizes involved; the use of AISI 4130 or 4130H is allowed.

ASTM A193 Grade B7M studs are identical in chemistry to Grade B7, as they are quenched and tempered carbon steel to achieve a lower hardness.

A193 B7 all thread studs, as well as hex bolts having diameters above 1" are most common 8UN (8 threads per inch).

What is the difference between ASTM A193 B7 and ASTM A193 B7M? ›

The maximum hardness of ASTM A193B7M is 235 HB or 99 HRB, while the maximum hardness of A193B7 is 321 HB or 35 HRC. The most notable difference from a manufacturing perspective is that when providing A193B7M bolts, every individual bolt or stud in the lot must be hardness tested.

A grade 8 bolt is the highest grade SAE bolt. Grade 8 bolts have a minimum tensile strength of 150,000 PSI.

Grade 8 is the hardest, Grade 5 is medium, and Grade 2 is the softest. This is the most common grade of steel fastener and is the least expensive. Grade 2 bolts have no head marking, although sometimes a manufacturer's mark is present. This grade of bolt is made from low or medium carbon steel.

Grade 5 bolts are hardened to increase strength and are the most common bolts found in automotive applications.

ASTM A307 Grade B is common for hvac/waterworks/low pressure systems. ASTM A193 B7 is common for general industrial use and high temperature/pressure.

Yes they can. A common misconception is that B7 bolts cannot be galvanized. That misconception is wrong.

However, 4340 has more carbon, while 4140 has more chromium. One of the most significant differences between the two metals is the inclusion of nickel in 4340 steel, which accounts for the metal's greater strength and fracture toughness.

There are two major types of B7 proteins: B7-1 or CD80, and B7-2 or CD86. It is not known if they differ significantly from each other. So far CD80 is found on dendritic cells, macrophages, and activated B cells, CD86 (B7-2) on B cells. The proteins CD28 and CTLA-4 (CD152) each interact with both B7-1 and B7-2.

ASTM A193 B7 is a Bolting specification for medium-high temperature applications. It is a heat treated Chromium Molybdenum steel and is considered for applications up to 450°C (840°F).

No, when heat is reapplied to heat treated rod, it is possible the physical properties will be changed. Welding B7 is NOT recommended.

Can you weld high tensile bolts? ›

The general rule of thumb is that the welding of high-strength bolts is not permitted nor advised. During the manufacturing of these bolts, a specific heating process is used to reach each bolt's strength. When being reheated, this compromises the structure of the bolt, hence why it is not recommended.

ASTM A193 B7 is an alloy which includes chromium and molybdenum for added strength and corrosion resistance, rendering it suitable for applications that are highly susceptible to corrosion at high temperatures. For example, common uses are in chemical and petroleum facilities.

Threaded rods featuring a white color code are the strongest. The second-strongest color code is red, which is made of A4 stainless steel. The third-strongest color code for threaded fasteners is green, which is made of A2 stainless steel. Coming in fourth and five is yellow and unmarked, respectively.

While B7 and SAE Grade 5 fasteners have similar strengths, the B7 fasteners are intended for higher temperature applications. B7 fasteners are tempered at a higher temperature, 1100° F minimum, while Grade 5 bolts are tempered at 800° F minimum.

ASTM A193/B7

Due to its high tensile strength, B7 is one of the strongest materials in the industry. It is a grade of the spec A193 (Chromium Molybdenum). B7 achieves its strength through a heat-treating process where it is quenched and tempered at 1150 degrees F.

With a minimum tensile strength of 150 ksi and a minimum yield of 130 ksi, Grade 8 has a higher tensile and yield strength than other steel grades such as Grade 5 and B7. It is also quenched and tempered at 800 F leading to its strength.

This Grade B7M is heavily utilized in petroleum, Sewage, Water treatment and chemical construction applications. The ASTM standard covers alloy steel and stainless steel bolting materials for high temperature or high-pressure service.