China High-Strength Stainless Steel Fasteners - Inconel Bolts from China Suppliers & Factory Products, Product

Stainless steel high-strength fasteners are essential components manufactured from top-quality stainless steel materials, offering exceptional strength and corrosion resistance. Ideal for applications that endure heavy loads and harsh environments, these fasteners include various types such as authenticate stainless steel high-strength fasteners, martensitic stainless steel high-strength fasteners, ferritic stainless steel high-strength fasteners, and duplex stainless steel high-strength fasteners. As a leading factory in China, we pride ourselves on supplying durable and reliable high-strength fasteners to meet the diverse needs of different industries. Choose us as your trusted suppliers for all your stainless steel fastener requirements

Product Description

Austenitic Stainless Steel High-Strength Fasteners

Composition

Mainly contains chromium (16–26%) and nickel (6–22%). Common grades include 304 and 316.

Characteristics

Strong corrosion resistance, non-magnetic, good toughness, easy to process, and excellent welding performance.

Applications
  • (1)

    Austenitic stainless steel (such as 1.4310CSPFH, SUS301) is widely used in the manufacturing of food processing equipment, kitchenware (such as knives, pots) and tableware, meeting food-grade cleaning requirements and being less likely to contaminate food.

  • (2)

    Chemical and Energy Equipment
    Chemical industry: Used in reaction vessels, pipelines, storage tanks, etc., resistant to corrosive media such as acids, alkalis, and salts.
    Petroleum and natural gas: Manufacturing corrosion-resistant components such as valves and pump shafts; for example, S20910 stainless steel is suitable for high-temperature and high-pressure environments.

  • (3)

    Architecture and Decoration
    Building structure: Used for exterior walls, railings, roofs, etc., combining both beauty and durability.

  • (4)

    Transportation
    Automobile manufacturing: SUS301 is used for body structure components, exhaust pipes, etc., achieving both lightweight and high strength.
    Aerospace: Materials such as S20910 are used for engine parts and fasteners, meeting the requirements of high strength and high temperature resistance.

Martensitic Stainless Steel High-Strength Fasteners

Composition

Contains chromium (12–18%) and carbon (0.1–1.2%). Common grades include 410 and 420.

Characteristics

Strength and hardness can be enhanced through heat treatment, good wear resistance, but relatively weak corrosion resistance, and magnetic.

Applications
  • (1)

    Medical Devices and Surgical Instruments
    Surgical instruments such as scissors, forceps, surgical knives, etc., must meet the requirements of high hardness and corrosion resistance.

  • (2)

    Industrial Cutting Tools and Mechanical Components
    Food processing tools: For instance, Z30Cr13 martensitic stainless steel tools have superior corrosion resistance to Cl⁻ compared to 420J2.

  • (3)

    Aerospace and Defense
    Aircraft components: Used for missile casings, engine parts, etc., to meet requirements for high strength and corrosion resistance.

Ferritic Stainless Steel High-Strength Fasteners

Composition

Contains chromium (10.5–30%), low carbon content. Common grades include 430 and 446.

Characteristics

Excellent corrosion resistance, especially against stress corrosion, magnetic property, medium strength, average welding performance.

Applications
  • (1)

    Automobile Industry
    Exhaust system: such as exhaust pipes, mufflers, etc., utilizing their high-temperature oxidation resistance (working temperature up to 800℃) and low thermal expansion coefficient.

  • (2)

    Appliances and Kitchenware
    Appliance exteriors: refrigerator door handles, microwave oven shells, etc., meeting the requirements of durability and cleanliness.

  • (3)

    Commercial Installation
    Chemical containers: Used for corrosion-resistant linings or pipelines. For instance, the S32803 grade performs exceptionally well in chemical reactors.

Duplex Stainless Steel High-Strength Fasteners

Composition

Contains chromium (18–28%), nickel (4.5–8%), and molybdenum (2.5–4%). Common grades include 2205 and 2507.

Characteristics

Combines the advantages of austenite and ferrite, with high strength, excellent corrosion resistance, and strong resistance to stress corrosion and pitting corrosion.

💡 Duplex stainless steel's resistance to chloride stress corrosion cracking (Cl-SCC) is superior to that of austenitic stainless steel, making it ideal for harsh marine and chemical environments.
Applications
  • (1)

    Petroleum and Natural Gas Industry
    Sub sea pipelines and equipment: Duplex stainless steel (such as S31803) is used to manufacture sub sea pipelines, valves and pump bodies.
    High-pressure and high-temperature environment: Suitable for equipment used in oil and gas extraction, storage and transportation, such as the cooler for the effluent from hydrogenation reactors.

  • (2)

    Chemical and Environmental Protection Equipment
    Reactor and heat exchanger: In chemical production, used to contact acidic media (such as acetic acid, formic acid), with outstanding resistance to local corrosion.
    Flue gas desulfurization system: Resistant to corrosive environments containing sulfur and chloride ions.

  • (3)

    Ocean Engineering
    Vessel and Propeller: Resistant to seawater corrosion, suitable for marine platform components and high-pressure pipelines for seawater desalination.

  • (4)

    Architecture and Energy
    Nuclear power plant cooling system: Used in key facilities such as Blue Lock Nuclear Power Plant, resistant to high-temperature oxidation and stress corrosion.

High Strength Stainless Steel Fasteners — Available Types

Performance Introduction and Supply Range of Stainless Steel High Strength Fasteners

Types

Grade

Tensile Strength Min

Yield Strength Min

Elongation after Break Min

Percentage of Elongation Min

Percentage of Contraction Min

Hardness Range

Executive Standard

Scopes of Supply

HV

HRC

HBW

Austenitic Stainless Steel

A1
A2
A3

50

500

210

0.6d

ISO3506/1-2020

M1 — M140

70

700

450

0.4d

ISO3506/1-2020

M3 — M64

80

800

600

0.3d

ISO3506/1-2020

M3 — M48

A4
A5

50

500

210

0.6d

ISO3506/1-2020

M1 — M140

70

700

450

0.4d

ISO3506/1-2020

M3 — M64

80

800

600

0.3d

ISO3506/1-2020

M3 — M48

100

1000

800

0.2d

ISO3506/1-2020

M6 — M16

A8

70

700

450

0.4d

ISO3506/1-2020

M3 — M64

80

800

600

0.3d

ISO3506/1-2020

M3 — M36

100

1000

800

0.2d

ISO3506/1-2020

M6 — M16

Duplex Stainless Steel

D2
D4
D6
D8

70

700

450

0.4d

ISO3506/1-2020

M3 — M64

80

800

600

0.3d

ISO3506/1-2020

M3 — M48

100

1000

800

0.2d

ISO3506/1-2020

M6 — M16

Martensitic Stainless Steel

C1

50

500

250

0.2d

155 — 220

147 — 209

ISO3506/1-2020

M5 — M140

70

700

410

0.2d

220 — 330

20 — 34

209 — 314

ISO3506/1-2020

M5 — M140

110

1100

820

0.2d

350 — 440

36 — 45

ISO3506/1-2020

M5 — M64

C3

80

800

640

0.2d

240 — 340

21 — 35

228 — 323

ISO3506/1-2020

M5 — M140

120

1200

950

0.2d

380 — 480

39 — 48

ASTM F738M-02

M6 — M64

C4

50

500

250

0.2d

155 — 220

147 — 209

ISO3506/1-2020

M1 — M140

70

700

410

0.2d

220 — 330

20 — 34

209 — 314

ISO3506/1-2020

M3 — M64

110

1100

820

0.2d

350 — 440

36 — 45

ASTM F738M-02

M6 — M64

Precipitation-Hardening Stainless Steel

P1

90

900

700

0.2d

285 — 370

28 — 38

ASTM F738M-02

M6 — M64

XM-12

H900

1310

1170

10%

35%

40 Min

ASTM A564-2019

M5 — M140

XM-13

H950

1515

1415

10%

45%

45 Min

ASTM A564-2019

M5 — M140

XM-16

H900

1620

1515

8%

30%

47 Min

ASTM A564-2019

M5 — M140

XM-25

H900

1240

1170

10%

40%

39 Min

ASTM A564-2019

M5 — M140

S11100

H900

1700

1590

11%

43%

47 Min

ASTM A564-2019

M5 — M140

S17400

H900

1310

1170

10%

40%

40 Min

ASTM A564-2019

M5 — M140

S45503

H900

1620

1520

8%

30%

47 Min

ASTM A564-2019

M5 — M140

S46500

H950

1655

1515

10%

45%

47 Min

ASTM A564-2019

M5 — M140

Frequently Asked Questions (FAQ)
Q What is the difference between austenitic and martensitic stainless steel fasteners?
Austenitic stainless steel fasteners (e.g., grades 304, 316) are non-magnetic, offer excellent corrosion resistance, and are easy to weld and process. Martensitic stainless steel fasteners (e.g., grades 410, 420) are magnetic, can be hardened through heat treatment for higher strength and wear resistance, but have relatively lower corrosion resistance compared to austenitic types.
Q Why is duplex stainless steel preferred for offshore and marine applications?
Duplex stainless steel (such as grades 2205 and 2507) combines the properties of both austenitic and ferritic stainless steels, providing significantly higher strength and superior resistance to chloride stress corrosion cracking (Cl-SCC) and pitting corrosion. This makes it the preferred material for subsea pipelines, marine platforms, and seawater desalination equipment.
Q What executive standards apply to these high-strength stainless steel fasteners?
The fasteners are manufactured and tested according to internationally recognized standards, primarily ISO 3506/1-2020 for austenitic, ferritic, martensitic, and duplex types, and ASTM F738M-02 and ASTM A564-2019 for precipitation-hardening stainless steel grades.
Q What size range is available for stainless steel high-strength fasteners?
The supply range varies by material type and grade. Generally, sizes from M1 to M140 are available for many grades, while specific grades such as A4/A5-100 and duplex D-series grade 100 are available from M6 to M16. Please refer to the detailed performance table above for the exact scope of supply for each grade.
Q What are the advantages of precipitation-hardening stainless steel fasteners?
Precipitation-hardening stainless steel fasteners (such as S17400, S11100, XM-16) offer exceptionally high tensile and yield strengths — up to 1700 MPa tensile strength — achieved through a controlled aging heat treatment process. They combine high strength with good corrosion resistance, making them ideal for aerospace, defense, and high-performance industrial applications.
Q Is ferritic stainless steel suitable for high-temperature applications?
Yes. Ferritic stainless steel fasteners exhibit excellent high-temperature oxidation resistance, with a working temperature of up to 800℃, along with a low thermal expansion coefficient. This makes them particularly well-suited for automotive exhaust systems, including exhaust pipes and mufflers, as well as other high-temperature industrial environments.

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