Ningbo QS Customized 660 Fastener Solutions for Your Specific OEM Project Requirements

Product Description

Company Profile

ABOUT US

Xiamen Qishine Industry Co., Ltd. is a Chinese company established in 2013. We are a leading fabrication services provider in industries such as Oil & Gas, Petroleum, Marine, Oilfield, Mining, and Heavy Industry, specifically for pipeline construction and maintenance.

Qishine is ideal choice for EPC companies and project contractors. Our company specializes in supplying a range of products including Fasteners, Flanges, Gaskets, Fittings, Valves, Pipes and Piping Spare Parts. Our products are API, CE, TUV and ISO certified.   Products are widely used on oil rigs, new nuclear power plant, Chemical and Heavy Industry.

Qishine is proud as being a premium product supplier who works closely with our clients to achieve the best possible results. We have an experienced team, skilled labor force, and advanced facilities to ensure safe and efficient project completion, meeting deadlines and budget requirements.

Qishine is ideal choice for EPC companies and project contractors.     

Product Description

 A453 Gr.660 High-Temperature Alloy Fastener

Overview

The X6NiCrTiMoVB25-15-2 is a precipitation-hardenable, austenitic stainless steel alloy, more commonly known by its UNS designation S66286 or the trademarked name A-286. Fasteners manufactured from this alloy are engineered for use in high-stress applications where exceptional strength and corrosion resistance are required at elevated temperatures.

Key Characteristics & Advantages

• Excellent High-Temperature Strength: Retains a high percentage of its tensile and creep strength at temperatures ranging from -250°C to 700°C (-418°F to 1292°F), making it superior to standard stainless steels.

• Outstanding Creep & Stress Rupture Resistance: Designed to withstand constant load and deformation under stress at high temperatures for extended periods.

• Good Corrosion Resistance: Offers excellent resistance to oxidation and scaling, as well as good performance in various corrosive atmospheres, comparable to Type 304 stainless steel.

• Precipitation Hardenable: The alloy is solution annealed and then aged to achieve its high strength levels, which cannot be attained through work hardening alone.

Common Specifications and Standards

Fasteners made from this alloy typically conform to the following standards:

• ASTM A453 / A453M: Standard Specification for High-Temperature Bolting

• ASME SA453: Equivalent ASME standard for pressure vessel applications.

• AMS 5731: Aerospace Material Specification for bars, wires, and forgings.

• AMS 5737: For fasteners specifically.

• UNS S66286: Unified Numbering System designation.

Typical Chemical Composition (Weight %)

 

 

Element	Content (%)
Iron (Fe)	Balance
Nickel (Ni)	24.0 - 27.0
Chromium (Cr)	13.5 - 16.0
Molybdenum (Mo)	1.0 - 1.5
Titanium (Ti)	1.9 - 2.35
Vanadium (V)	0.10 - 0.50
Boron (B)	0.001 - 0.010
Carbon (C)	≤ 0.08
Manganese (Mn)	≤ 2.00
Silicon (Si)	≤ 1.00

Mechanical Properties (Aged Condition - Representative Values)

 

 

Property	Value
Tensile Strength	≥ 1300 MPa (189 ksi)
Yield Strength (0.2% Offset)	≥ 830 MPa (120 ksi)
Elongation	≥ 15%
Hardness	Rockwell C 30 - 38 (Approx.)

Primary Applications

This alloy is the material of choice for critical high-temperature bolting in demanding industries:

• Aerospace: Jet engine components, turbine blades, casing bolts, afterburner parts.

• Power Generation: Gas turbines, turbochargers, high-temperature bolting for steam turbines.

• Automotive & Racing: High-performance turbo systems and exhaust components.

• Nuclear Industry: Core components and instrumentation.

Summary
In essence, X6NiCrTiMoVB25-15-2 (A-286) fasteners are premium, high-performance components designed for the most challenging environments where failure is not an option. They provide an optimal balance of immense strength, long-term stability, and reliable corrosion resistance at extreme temperatures.


The stainless steel material used in 316/304 fasteners is highly resistant to corrosion, making it ideal for use in food and beverage processing applications, where hygiene and safety are critical. It is also resistant to extreme temperatures, which makes it suitable for use in high-temperature applications, such as cooking and sterilization.
 

ASTM A193 Stud Bolts: Chemical Composition

Physical Element	ASTM A193 grade B7 (AISI 4140)	ASTM A193 grade B8 (AISI 304)	ASTM A193 grade B8M (AISI 316)
Carbon	0.38 - 0.48%	0.08% max	0.08% max
Manganese	0.75 - 1.00%	2.00% max	2.00% max
Phosphorus, max	0.035%	0.045%	0.045%
Sulfur, max	0.040%	0.030%	0.030%
Silicon	0.15 - 0.35%	1.00% max	1.00% max
Chromium	0.80 - 1.10%	18.0 - 20.0%	16.0 - 18.0%
Nickel	absent	8.0 - 11.0%	10.0 - 14.0%
Molybdenum	0.15 - 0.25%	absent	2.00 - 3.00%

ASTM A193 Stud Bolts: Mechanical Properties

ASTM A193	Size	Min Tensile Strength (KSI)	Min Yield Strength (KSI)	Min Elongation (%)	RA % min	Max HBW	Max HRC
ASTM A193 grade B7	Up to 2-1/2	125	105	16	50	321	35
	2-5/8 - 4	115	95	16	50
	4-1/8 - 7	100	75	18	50
ASTM A193 grade B8 Class 1	All	75	30	30	50	223	35
ASTM A193 grade B8M Class 1	All	75	30	30	50	223	96
ASTM A193 grade B8 Class 2	Up to 3/4	125	100	12	35	321	35
	7/8 - 1	115	80	15	35
	1-1/8 - 1-1/4	105	65	20	35
	1-3/8 - 1-1/2	100	50	28	45
ASTM A193 grade B8M Class 2	Up to 3/4	110	95	15	45	321	35
	7/8 - 1	100	80	20	45
	1-1/8 - 1-1/4	95	65	25	45
	1-3/8 - 1-1/2	90	50	30	45

 

The material chosen for the threaded stud and the hex nuts should be compatible. Materials for bolting sets shall be selected based on the process's working temperatures, as shown in the table below:

	TEMPERATURE °C ( °F )
STUD BOLTS MATERIALS	MIN.	MAX.
CARBON STEEL	-29 (-20)	300 (572)
A193 B7, L7	-73 (-100)	400 (752)
A193 B6	0 (32)	500 (932)
A193 B8	-200 (-325)	575 (1067)
A193 B16	0 (32)	520 (968)
A193 B17B	-29 (-20)	650 (1202)
A913 Inconel 718	0 (32)	750 (1382)
A453 Gr. 660	-29 (20)	538 (1000)

Products to our clients.

 

Our Superiority

Why choose Qishine?

High Quality: Qishine provide high quality products.
Reasonable and Competitive Price: Our products are sales well in oversea markets,especially in Europe, South America and Africa.
Professional Service: Qishine's sales team have rich experience in exporting and projects service.
Fast Delivery: Fast deliver the goods to all of the world.
One Stop Service: We provide gaskets,screws,flanges,pipes and fittings.Best choice for EPC companies and projects' construction.

Who choose Qishine?

Application:

 

FAQ

About Sample

 1.We can offer samples for testing,courier freight afforded by the receiver .

 2.For cost saving, freight prepaid is recommended.

 3.Special requirement accepted
 

About Order
 

1.Payment Term: T/T, L/C

2.Trade Term:  EXW, FCA, FOB, CFR,CIF,DDU

3.Documents: CI, PL, CO,MTC and BL.
 

About After Sale Service

Product Quality Guarantee: We guarantee our products quality for 12months from the date of BL.