ASTM A193 B16 High Temperature Stud Bolt

ASTM A193 B16 High Temperature Stud Bolts are engineered for severe service environments involving elevated temperatures, high pressure, and cyclic thermal loading. Crafted from a chromium-molybdenum-vanadium alloy, enhancing high-temperature strength. They’re suitable for use in environments where temperatures exceed 700°F with a maximum service temp of about 1100°F, Grade B16 provides improved creep resistance and superior mechanical stability compared to standard B7 fasteners.

Key Advantages of ASTM A193 B16 Stud Bolts

✔ Excellent high-temperature strength retention

✔ Superior creep and relaxation resistance

✔ Improved performance over B7 in elevated heat service

✔ Stable mechanical properties under cyclic thermal loading

✔ Suitable for pressure boundary flange connections

✔ Long service life in refinery and power plant systems

✔ Compatible with ASTM A194 Grade 7 nuts

Technical Specifications

Parameter	Specification
Product Name	ASTM A193 B16 High Temperature Stud Bolt
Material Grade	Chromium-Molybdenum-Vanadium Alloy Steel
Standard	ASTM A193
Equivalent System	ASME / ANSI Flange Systems
Thread Type	UNC, UNF, 8UN, Metric
Diameter Range	1/4″ – 4″ (M6 – M100)
Length Range	Up to 6000 mm
Operating Temperature	Up to 593°C (1100°F)
Creep Resistance	Excellent
Heat Treatment	Quenched & Tempered
Surface Finish	Black Oxide / Plain / Coated
Inspection	PMI, Mechanical Testing, Dimensional Control
Certification	EN10204 3.1 / 3.2

Chemical Composition

Elements	Range	Product Variation, Over or Under
Carbon	0.36 – 0.47%	0.02
Manganese, max	0.45 – 0.70%	0.03
Phosphorus, max	0.04%	0.005 over
Sulfur, max	0.04%	0.005 over
Silicon	0.15 – 0.35%	0.02
Chromium	0.80 – 1.15%	0.05
Molybdenum	0.50 – 0.65%	0.03
Vanadium	0.25 – 0.35%	0.03
Aluminium, Max	0.02%

Note : Product analysis – Individual determinations sometimes vary from the specified limits on ranges as shown in the tables. The several determinations of any individual element in a heat may not vary both above and below the specified range.

Mechanical Properties

Mechanical Properties for Metric ASTM A193 Grade B16 Bolts
Diameter mm	Min Tempering Temperature, °C	Tensile Strength min, MPa	Yield strength, min, 0.2% offset, MPa	Elongation in 4D min, %	Reduction of Area, min, %	Hardness, max
M64 and Under	650	860	725	18	50	321 HBW or 35 HRC
over M64 to M100	650	760	655	17	45	321 HBW or 35 HRC
over M100 to M180	650	690	585	16	45	321 HBW or 35 HRC

Mechanical Properties for Imperial ASTM A193 Grade B16 Bolts
Diameter Inch	Min Tempering Temperature, °C	Tensile Strength min, ksi	Yield strength, min, 0.2% offset, ksi	Elongation in 4D min, %	Reduction of Area, min, %	Hardness, max
2.5 and under	1200	125	105	18	50	321 HBW or 35 HRC
over 2.5 to 4	1200	110	95	17	45	321 HBW or 35 HRC
over 4 to 7	1200	100	85	16	45	321 HBW or 35 HRC

Applications

Power Generation Industry	Oil & Gas Refining	Petrochemical Plants	Industrial Heat Systems
Steam turbines	Catalytic cracking units	Pressure vessels	Thermal processing equipment
Boiler systems	Hydroprocessing units	Heat exchangers	High-temperature valves
High-pressure steam lines	High-temperature piping systems	Furnace assemblies	Furnace flange connections
Heat recovery steam generators (HRSG)	Refinery reactors	Process piping systems	…

Application

✔ High-temperature pressure boundary flange joints ✔ Refinery and power plant equipment ✔ Boiler, heat exchanger & high temp pipeline connections ✔ Steam service and cyclic thermal loading systems

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