Alloy steel bolting materials meeting ASTM A193 Grade B16 criteria are the norm for strain vessels, valves, flanges, and fittings meant to face up to excessive temperatures and pressures. The maximum frequent users of these applications are the petrochemical, oil & gas, and power generation fields.

The chemical make-up of grade B16 bolts is as follows: silicon (0.15-zero.35%), chromium, manganese, phosphorus, sulfur, vanadium, and carbon. Grade B16 bolts are the maximum broadly used sort of alloy metal amongst numerous versions. These bolts' precise composition offers them with exquisite resistance to oxidation and sulfidation in addition to excessive temperature power.

To make certain that Grade B16 bolts are suitable and reliable for use in excessive-temperature and high-strain settings, the ASTM A193 widespread specifies necessities for his or her manufacturing, warmth treatment, and testing.

Could you explain the differences between B16 and B7 bolts?

While B7 and B16 bolts have similar features, what sincerely distinguishes them are their mechanical houses and material composition.

Enterprises coping with accelerated temperatures and pressures regularly make use of bolts with the B7 and B16 classifications. This is specially actual for the petrochemical, power era, and oil and gasoline sectors.

In order to achieve the required hardness and electricity, the medium carbon alloy metallic (4140) used to create B7 bolts and ASTM A193 B8 Bolts is often heated to the best temperature and then tempered. They have minimal yield and tensile strengths of 105 ksi and 125 ksi, respectively.

But the metal used to make B16 bolts is a higher alloy metal with molybdenum, chromium, and vanadium combined collectively. B16 bolts are stronger and extra proof against oxidation and sulfidation in warm conditions way to those additives. Moreover, B16 bolts have minimal yield and tensile strengths which can be corresponding to B7 bolts.

Use B7 bolts for packages desiring high energy and mild temperature resistance; use B16 bolts for packages requiring better energy and stronger resistance to oxidation and sulfidation at immoderate temperatures. B7 bolts are the endorsed desire while some diploma of heat resistance is vital.

Materials that are comparable to ASTM A193 Grade B16 consist of:

DIN EN 10269 1.4980:

European standard addresses bolts composed of a robust and heat-resistant chromium-molybdenum alloy steel.

ISO 898-1 class 10.9:

For bolts composed of alloy steels comparable to ASTM A193 Grade B16, International Standard ISO 898-1 class 10.9 provides mechanical criteria.

BS 1501-640B:

One can use British standard BS 1501-640B to fabricate fastening materials with characteristics comparable to ASTM A193 B8C bolts and ASTM A193 Grade B16. This general applies to high-power steel plates which have gone through heat remedy.

JIS SCM 4: 

This Japanese business well-known specifies what to do with low-alloyed steels which have mechanical characteristics and chemical compositions equivalent to ASTM A193 Grade B16 and ASTM A193 B8M Stud Bolt.

It's vital to hold in mind that at the same time as the chemical composition and mechanical traits of numerous materials may be equal, their manufacturing methods, warmth remedy methods, and trying out requirements may additionally range. These variations may have an impact on the materials' performance for particular applications. It is advisable to study the pertinent material requirements and get advice from an experienced engineer or metallurgist when selecting bolting materials for applications involving high temperatures and pressures.