ASTM A193 B16 Round Bars Supplier & Stockist in India

ASTM A193 B16 round bar is chromium-molybdenum-vanadium alloy steel bar made to the Grade B16 chemistry of ASTM A193 / ASME SA193. It is the starting material for studs, bolts and threaded rods in high-temperature, high-pressure service, and is chosen over B7 where creep and stress-relaxation resistance matter. Minimum strength is 860 MPa tensile and 725 MPa yield up to 64 mm diameter. Jade Alloys stocks B16 round bar in Mumbai and exports worldwide with EN 10204 3.1 mill test certificates.

Buyers search for this material as A193 B16 round bar, SA 193 B16 round bar, B16 alloy steel bar or B16 bolt material. They all describe bar in B16 grade, normally bought to machine studs, double-end studs, heavy hex bolts and threaded rods for boilers, steam and gas turbines, valves, pressure vessels and flanged joints. We supply black hot-rolled, peeled and bright bar from [10-200 mm] diameter in 1000-6000 mm lengths or cut to size, in as-rolled, annealed or quenched-and-tempered condition. Also available as hex, square, flat, hollow and threaded bar. Check what is ex-stock, read about us, or see how the bar becomes stud bolts and ASTM A193 B16 bolts.

ASTM A193 / A193M is the standard specification for alloy-steel and stainless steel bolting used in high-temperature or high-pressure service on pressure vessels, valves, flanges and fittings. Grade B16 is its chromium-molybdenum-vanadium grade. Vanadium refines the grain and forms stable carbides, which helps the steel keep its clamping load (resist stress relaxation) and resist creep at temperatures where plain Cr-Mo grades such as B7 begin to lose strength.

A193 is a bolting specification, not a bar-stock specification. B16 round bar is supplied in the B16 grade and in a heat-treated condition so that it can be machined into studs and bolts, with chemistry and mechanical results shown on the mill test certificate. Whether a bar is accepted for a given job depends on your client’s specification, so tell us if the finished part must be bought as a finished fastener and we will quote ASTM A193 B16 bolts instead. Read the full standard overview on our ASTM A193 page. 

ASTM A193 B16 Round Bar Specifications

Surface finish codes

Equivalent Grades & Designations of ASTM A193 B16

Chemical Composition (%) of ASTM A193 B16 Round Bars

Role of the key elements: carbon gives hardenability and strength; chromium and molybdenum give through-hardening, tempering resistance and elevated-temperature strength; vanadium forms fine carbides that raise creep and relaxation resistance. There is no nickel in B16, which is why it is not a corrosion-resistant grade.

Mechanical Properties of ASTM A193 B16 Round Bar and Heat Treatment

Heat treatment: B16 is austenitised, quenched in oil and tempered. The specification sets a minimum tempering temperature of about 650 C (1,200 F). Tempering well above the service temperature is what keeps the bar stable in hot service.

Physical properties (typical, low-alloy Cr-Mo-V steel)

Sizes, Tolerances and Weight Chart of ASTM A193 B16 Alloy Steel B16 Round Bars

Stock lengths 1000-6000 mm; cut-to-size available. Weight per metre = diameter in mm squared x 0.00617 (density 7.85 g/cm3).

For other sizes, hex, square and flat bar, use our metal weight calculator.

Inch to millimetre reference