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Alloy 330 Socket Head Cap Screws

Alloy 330 Socket Head Cap Screws are specifically designed for high temperature furnace applications such as vacuum furnaces, heat treating and brazing applications. The most prized trait of alloy 330 is its ability perform under cyclic conditions of temperature extremes from heating and cooling; as well as in alternate carburizing and oxidizing atmospheres. An austenitic, nickel-chromium-iron-silicon alloy, Alloy 330 Socket Head Cap Screws also offer industry a low coefficient of expansion, excellent ductility, and high strength.

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An engineered high temperature resistant steel
Excellent high temperature stability and chemistry and specifications
Very oxidation and carburization resistant to 2100°F
Good resistance to thermal shock and quenching
Resistance to thermal shock from repeated quenching
High level of resistance to oxidation and carburization
Ability to handle thermal cycling
Provides resistance to scale formation up to about 2000°F
Good resistance to nitrogen-containing atmospheres where the oxygen content is low
High nickel content of 34-37% provides high resistance to chloride stress corrosion cracking and embrittlement

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RAYCHIN LIMITED

Name: Alloy 330 Socket Head Cap Screws
SKU: 0

Specialist in Alloy 330 Socket Head Cap Screws · UNS N08330 · 1.4886

Alloy 330 Socket Head Cap Screws: High‑Strength Fasteners for Extreme Heat

Austenitic Nickel‑Chromium‑Iron‑Silicon Alloy (UNS N08330 / 1.4886 / X12NiCrSi35-16)

RAYCHIN LIMITED is a premier manufacturer of Alloy 330 Socket Head Cap Screws. Engineered for demanding high‑temperature furnace environments, these screws deliver exceptional strength, oxidation resistance, and thermal stability up to 1150°C. Our Alloy 330 socket head cap screws are available in standard, low head, button head, and shoulder screw configurations, with inch (UNRC/UNRF) and metric coarse/fine threads. Manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS – or fully custom to your drawing.

Alloy 330 Socket Head Cap ScrewsAlloy 330 hex socket screwsUNS N08330 socket head1.4886 socket cap screwsAlloy 330 low head cap screwsAlloy 330 button head socket screwshigh temperature alloy socket screwsfurnace socket head cap screwsAlloy 330 shoulder screwsAlloy 330 socket head ASTM

Alloy 330 Socket Head Cap Screw – Types & Configurations

Standard socket headLow head socket capButton head socketSocket head shoulder screwReduced headExtra long shank

We manufacture all common configurations for Alloy 330 socket head cap screws to ASME B18.3 (inch series), ISO 4762 / DIN 912 (metric), and NAS/NASM standards. Diameters from #0 (M1.6) up to 2" (M48), lengths 3mm to 300mm. Full thread, partial thread, and custom shank lengths. Drive options: hex socket, Torx®, spline, and hexalobular. Precision forged heads for optimal grain flow and high‑temperature integrity.

International Standards & Global Designations for Alloy 330

Our Alloy 330 Socket Head Cap Screws are manufactured from material meeting these worldwide specifications:

Country / Region	Standard / Specification	Designation / Grade
USA	ASTM B408 / A473, ASME SB-408, AMS 5592, AMS 5716, ASTM F2281	UNS N08330 · Alloy 330 · RA330
Europe (CEN)	EN 10095, EN 10269 (fasteners), EN 10088-3	1.4886 · X12NiCrSi35-16
Germany (DIN)	DIN 17752, DIN 17470, DIN EN 1.4886	X12NiCrSi35-16 / 1.4886
France (NF)	NF A35-572/573 (historical)	Z12NCS35.16
China (GB)	GB/T 20878, GB/T 4238, GB/T 1220	0Cr12Ni35Si16 / S33010 / 330
Japan (JIS)	JIS G 4312, JIS G 4902	SUH330 / NCF 330
ISO	ISO 4955, ISO 13680	X12NiCrSi35-16
Sweden (SS)	SS 14 23 78 (obsolete)	2378

UNS N08330 1.4886 X12NiCrSi35-16 ASTM B408 AMS 5592 AMS 5716 NAS 330 AN 330 ASTM F2281 SUH330 S33010

Chemical Composition (Weight %) – Alloy 330 (UNS N08330 / 1.4886)

Our Alloy 330 socket head cap screws are produced from certified melts conforming to ASTM B408 / A473 limits:

Element	ASTM B408 / UNS N08330 Range %	Typical
Carbon (C)	≤ 0.08	0.05
Silicon (Si)	0.75 – 1.50	1.2
Manganese (Mn)	≤ 2.00	1.0
Phosphorus (P)	≤ 0.030	0.020
Sulfur (S)	≤ 0.030	0.010
Chromium (Cr)	17.0 – 20.0	19.0
Nickel (Ni)	34.0 – 37.0	35.5
Copper (Cu)	≤ 0.50 – 1.00	0.3
Molybdenum (Mo)	≤ 0.75	0.3
Iron (Fe)	Balance	Balance

Metallurgical note: High nickel (34‑37%) + chromium (17‑20%) + silicon (0.75‑1.5%) gives Alloy 330 exceptional resistance to oxidation, carburization, and thermal shock up to 1150°C. Ideal for socket head cap screws in cyclic heating/cooling furnace environments.

Complete Mechanical Properties – Alloy 330 Socket Head Cap Screws (Solution Annealed)

All socket head cap screws are supplied in the solution annealed condition (1038‑1066°C / water quench). Minimum tensile requirements per ASTM B408 / A473 for bar stock used in fasteners:

Property	Metric (min)	Imperial (min)
Tensile Strength (Rm)	585 – 750 MPa	85 – 109 ksi
Yield Strength 0.2% (Rp0.2)	≥ 205 – 290 MPa	≥ 30 – 42 ksi
Elongation (A5)	≥ 30 – 45%	≥ 30 – 45%
Hardness (HRB)	≤ 95 HRB	≤ 95 HRB
Modulus of Elasticity	196 GPa	28,400 ksi
Density	8.08 g/cm³	0.292 lb/in³

High Temperature Performance of Alloy 330 Socket Head Cap Screws

Alloy 330 is specifically formulated for elevated temperature service. The following data represent short‑time elevated temperature yield strength (0.2% offset) based on typical annealed condition:

Temperature	Yield Strength Rp0.2 (approx.)
21°C (70°F)	205 – 290 MPa (30 – 42 ksi)
538°C (1000°F)	140 MPa (20.3 ksi)
649°C (1200°F)	130 MPa (18.9 ksi)
760°C (1400°F)	115 MPa (16.7 ksi)
871°C (1600°F)	75 MPa (10.9 ksi)
982°C (1800°F)	35 MPa (5.1 ksi)
1093°C (2000°F)	20 MPa (2.9 ksi) (short time)

Oxidation resistance: Continuous service in air up to 1150°C (2100°F); excellent resistance to scaling, carburization, and nitriding. The silicon addition enhances oxide spallation resistance during thermal cycling.

Thermal Stability & Physical Data

Maximum continuous service temperature (oxidizing)	1150°C (2100°F)
Solution annealing range	1038‑1066°C (1900‑1950°F)
Melting range	1371‑1427°C (2500‑2600°F)
Thermal conductivity at 500°C	21.6 W/m·K
Mean CTE (20‑1000°C)	18.0 ×10⁻⁶ /°C

Corrosion Resistance of Alloy 330 Socket Head Cap Screws

While Alloy 330 is optimized for high‑temperature environments, it offers good resistance to many corrosive conditions:

Oxidation & carburization: Exceptional resistance in air, combustion gases, and sulfur‑bearing atmospheres up to 1150°C.
Nitriding: Good resistance to nitrogen‑rich atmospheres (e.g., cracked ammonia).
Stress corrosion cracking: High nickel content (34‑37%) provides immunity to chloride SCC.
Aqueous corrosion: Similar to 310 stainless; suitable for organic acids, but NOT intended for strong reducing acids or chloride pitting environments.
Oxidizing sulfur: Performs well in oxidizing sulfur atmospheres.
Sigma phase embrittlement: Alloy 330 remains fully austenitic and resists sigma formation.

Corrosion note: Alloy 330 is not designed for seawater or strong chloride solutions (for those we offer 254 SMO). It excels in dry, oxidizing, carburizing, and nitriding atmospheres up to 1150°C.

Precision Manufacturing & Global Standards Compliance

Precision Forging & Heat Treatment

Our Alloy 330 socket head cap screws are precision forged from solution‑annealed bar stock, then thread rolled for improved grain flow and fatigue resistance. Each lot undergoes solution annealing (1038‑1066°C) and water quenching to guarantee optimum high‑temperature properties. Dimensional inspection on optical comparators and vision systems ensures compliance with ASME/ISO standards.

Traceability & Third‑Party Testing

Full traceability from melt to finished product. Certificates EN 10204 3.1/3.2. NDT (PT, MT, UT) available on request. Our quality system: ISO 9001:2015, AS9100D. We also comply with NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS, JIS, GB. Custom designs welcome.

Alloy 330 Socket Head Cap Screws – Typical Applications & Industries

Our Alloy 330 socket head cap screws are widely used in demanding high‑temperature assemblies:

Vacuum furnace hot zones
Heat treating baskets & fixtures
Radiant tube supports
Annealing covers & muffles
Gas turbine components
Petrochemical heater hangers
Exhaust system flanges
Salt bath furnace electrodes
Ceramic fiber module attachments
Thermal oxidizer internals

We also supply matching Alloy 330 hex nuts, washers, and threaded rods for complete high‑temperature bolting sets.

Why RAYCHIN LIMITED – The Alloy 330 Socket Head Cap Screw Authority

Metallurgical expertise

Engineers specializing in high‑temperature alloys. We guarantee proper solution annealing and rapid quench for every Alloy 330 socket head cap screw. In‑house PMI and mechanical testing.

Global approvals & inventory

ISO 9001:2015, AS9100D. Extensive stock of inch & metric sizes, all common head styles. Fast turnaround for prototypes and emergency shutdowns.

Custom capabilities

Special drive depths, non‑standard lengths, reduced shank, left‑hand threads, and custom head configurations. High‑temperature anti‑seize coatings available.

Full compliance

Manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS. Material certifications with full traceability. We speak English, German, Mandarin, Japanese.

Request a quote for Alloy 330 Socket Head Cap Screws – any standard or custom specification.

Contact our engineering team for application assistance, high‑temperature performance data, or NACE MR0175 suitability (case‑by‑case).

sales@ray-chin.com | +86 534 2166 566

ISO 9001:2015 · AS9100D · EN 10204 3.1/3.2 · third‑party inspection (DNV, Lloyds, TÜV) welcome.

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