303 Stainless Steel Sheet – The Free-Machining Champion for High-Speed Production

When your CNC spindle time counts, 303 Stainless Steel Sheet pays for itself every minute. With a deliberate sulfur addition (0.15 % min.), 303 delivers up to three times faster machining than standard 304 while still providing the corrosion resistance needed for indoor, mild-service, or decorative applications. From high-volume automatic screw-machine fittings to designer kitchen backsplashes, 303 Stainless Steel Sheet gives you excellent chip break-up, superior surface finish, and dramatically reduced tool wear—without the costly slowdowns common to 304 or 316 grades.

303 Stainless Steel Sheet – Premium No.4 Brushed Finish, Perfect for Kitchen Backsplashes

Key Features & Advantages

Free-machining sulfur – 2–3× faster production, longer tool life, lower part cost
Good corrosion resistance for mild atmospheres, food zones, and indoor applications
Non-seizing / non-galling – ideal for moving screw-machine parts
Excellent surface finish after turning, milling, or light polishing
Available in thin gauges (20 Ga–¼") for light-duty cladding or backsplash work
Full compliance – ASTM A895, EN 1.4305, AMS 5640
100 % recyclable, RoHS compliant

Technical Specifications

Table 1 – Chemical Composition (ASTM A895)

Element	Min %	Max %
Cr	17.0	19.0
Ni	8.0	10.0
S	0.15	0.35
C	—	0.15
Mn	—	2.00
Si	—	1.00
P	—	0.045
Fe	Balance

Table 2 – Mechanical & Physical Properties

Property	Value
Tensile Strength	620 MPa (90 ksi) min.
Yield Strength (0.2 %)	310 MPa (45 ksi) min.
Elongation in 2"	35 % min.
Hardness HRB	90 – 100
Density	8.0 g/cm³ (0.289 lb/in³)
Thermal Conductivity	16.2 W/m·K @ 100 °C
Magnetic Permeability	< 1.02 (annealed)

Available Sizes, Gauges & Finishes

Gauge	Thickness (in.)	Thickness (mm)	Sheet Size (ft)	Finish Options
20	0.036	0.91	4 × 8, 4 × 10	2B, No. 4
18	0.048	1.22	4 × 8, 5 × 10	2B, No. 4
16	0.060	1.52	4 × 8, 4 × 10	2B, No. 4, HL
14	0.075	1.90	4 × 8, 5 × 10	2B, HL
11	0.120	3.05	4 × 8	No. 1, HRAP
¼"	0.250	6.35	4 × 8, 5 × 10	No. 1, HRAP

Custom slit coils, circles, and deburred edges available upon request.

Product Variants & Purchasing Guide

Looking for 303 stainless steel data sheet? Download instantly after RFQ. As a tier-one 303 stainless steel sheet factory located in Jiangsu, China, we publish a transparent daily 303 stainless steel sheet price index linked to LME nickel and sulfur additive costs. Our stockholding program keeps over 1,200 t of 303 stainless steel sheet for sale in standard and non-standard sizes, ready for same-day cutting. Customers searching 303 stainless steel sheet china sources choose us for PED/ISO-certified production, export packaging, and multilingual technical support. Whether you need one pallet of 303 stainless steel 20 gauge sheeting bacplash for a hotel project or a full container of blanks for automotive fittings, you receive the most competitive 303 stainless steel sheet pricelist direct from our 303 stainless steel sheet supplier team—no trader margins.

Superior machinability – 303 enables 2–3× faster production than 304/316

Main Applications

Automatic screw-machine bolts, nuts, and studs
Precision gears, bushings, shafts, and couplings
Valve and pump trim, pneumatic cylinders
Kitchen equipment: 303 stainless steel 20 gauge sheeting bacplash, countertops, equipment panels
Instrument housings, sensor brackets, electronic shields
Food-processing guides and rails (mild corrosive environments)
Architectural trim and decorative wall panels

Why Choose Us as Your 303 Stainless Steel Sheet Supplier

Direct mill relationship – factory gate 303 stainless steel sheet price
EN 10204 3.1 / 3.2 mill test certificates supplied free
Third-party inspection: SGS, BV, TÜV on request
Same-day cutting (shear, laser, water-jet) ±0.1 mm tolerance
15 years export experience to 68 countries – anti-fumigation crates, VCI film, insurance
Live inventory portal updated hourly – always know what is for sale

Direct from Our 303 Stainless Steel Sheet Factory in China – Large Stock, Fast Delivery Worldwide

Grade Comparison Table: 303 vs 304 vs 316 vs 303Se vs 416

Grade	S Content	Mo	Corrosion	Weldability	Machinability Rating	Typical Relative Cost
303	0.15-0.35	0 %	Moderate	Poor	90 % (excellent)	1.0× (baseline)
304	≤0.030	0 %	Good	Excellent	45 %	0.95×
316	≤0.030	2-3 %	Superior	Excellent	45 %	1.3×
303Se	Se≥0.15	0 %	Moderate	Poor	95 %	1.1×
416	≥0.15	0 %	Poor	Poor	95 % (magnetic)	0.9×

FAQ – 303 Stainless Steel Sheet

What is the biggest advantage of 303?
Added sulfur gives up to 3× faster machining and excellent chip control, lowering cycle time and tool costs.
Can 303 sheet be welded?
Welding is not recommended due to hot-cracking risk; use 304 or 347 for welded assemblies and bolt on 303 parts.
How does the daily 303 stainless steel sheet price compare with 304?
303 is typically 3-5 % higher than 304 base due to sulfur addition and specialised melting; our live 303 stainless steel sheet pricelist keeps you updated.
Is 303 stainless steel sheet suitable for a kitchen backsplash?
Yes, 20 gauge No. 4 finish (303 stainless steel 20 gauge sheeting bacplash) offers a decorative, easy-clean surface for low-chlorine indoor environments.
Which finishes are in stock at the China factory?
2B, BA, No. 4, HL, and micro-peeled; custom polishing up to Ra 0.2 µm available.
Do you supply a downloadable 303 stainless steel data sheet?
Absolutely – click “Download” on the product page for PDF certified to ASTM A895.
What thickness tolerance do you guarantee?
ASTM A480/A895 standard tolerances; half-tolerance possible on request.
How fast can you ship from China?
Standard 7-day lead time plus 3-5 days ocean freight to major ports; air-cargo 48 h for urgent projects.

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Stop paying trader mark-ups. Contact the 303 stainless steel sheet factory directly for today’s lowest 303 stainless steel sheet price, immediate 303 stainless steel data sheet download, and same-day cutting.

303 Stainless Steel Plate – The World’s Most Machinable Stainless Grade for High-Volume CNC Production

When your CNC or automatic screw machine needs to run faster, 303 Stainless Steel Plate delivers the competitive edge. With 0.15–0.35 % sulfur deliberately added, this free-machining grade offers 2–3× higher machining speeds and superior chip-breaking compared to standard 304 or 316, while still providing good corrosion resistance for mild-service applications. From precision-machined valve bodies and pump parts to food-processing equipment bases and electronic housings, 303 stainless steel plate maximises spindle uptime, extends tool life, and reduces unit cost—making it the first choice for high-volume producers of turned, milled, or ground components worldwide.

Caption: 303 Stainless Steel Plate – Ultra-Machinable Grade, 2–3× Faster Than 304, Perfect for Mass Production

Key Features & Benefits

Free-machining sulfur 0.15–0.35 % – 90 % machinability rating vs 45 % for 304
Excellent chip break-up – longer tool life, lower production cost
Good corrosion resistance for indoor, food-zone, and mild chemical environments
Non-galling / non-seizing – ideal for moving screw-machine parts
Non-magnetic in annealed condition; low permeability after cold work
Available in both plate and bar configurations – full 321 stainless steel bar or plate range
Full ASTM A895, A240, A582, EN 1.4305, AMS 5640 compliance
100 % recyclable, RoHS compliant

Technical Specifications

Table 1 – Chemical Composition (ASTM A895)

Element	303 %	303Se %	304 %
Cr	17.0–19.0	17.0–19.0	18.0–20.0
Ni	8.0–10.0	8.0–10.0	8.0–10.5
S	0.15–0.35	≤0.060	≤0.030
Se	—	≥0.15	—
C	≤0.15	≤0.15	≤0.08
Fe	Balance	Balance	Balance

Table 2 – Mechanical & Machinability Data

Property	303 Plate	304 Plate	316 Plate
Tensile Strength	≥620 MPa	≥515 MPa	≥515 MPa
Yield Strength (0.2 %)	≥310 MPa	≥205 MPa	≥205 MPa
Elongation in 2"	≥35 %	≥40 %	≥40 %
Hardness HRB	90–100	≤92	≤95
Machinability Rating	90 % (excellent)	45 % (good)	45 % (good)
Chip Break-Up	Superior	Fair	Fair
Weldability	Poor*	Excellent	Excellent

*Welding not recommended due to hot-cracking risk; use 304/347 for welded joints and bolt on 303 parts.

Standard Sizes & Thickness

Thickness (mm)	Standard Sizes (mm)	Weight (kg/m²)	Finish Options
3–12	1500 × 6000	24–96	No.1, pickled
12–30	2000 × 6000	96–240	No.1, HRAP
30–60	2000 × 6000	240–480	No.1, forged
60–100	2500 × 12000	480–800	No.1, forged

Custom cut-to-size and 304 stainless steel plate thickness from 3 mm to 100 mm available.

Product Range & Market Info

As one of the largest and most professional 321 stainless steel plate factory & 321 stainless steel plate manufacturer in China, we operate a 180 000 t/year Steckel mill with in-house solution annealing up to 1200 °C dedicated to 321 stainless steel plate production. Our 180 000 m² facility keeps 30 000 t of ready 321 stainless steel plate for sale in Shanghai and Houston, ensuring immediate availability for global aerospace and furnace builders. Whether you need one sheet of 10 mm × 1500 mm × 6000 mm or a full vessel of 80 mm × 2500 mm × 12000 mm, our mill-direct 321 stainless steel plate china pricing and ABS-approved quality give you the competitive edge. Contact our export team today for the most updated quotation and downloadable 3.1 MTC.

Specialty products include both plate and 321 stainless steel bar or plate – rounds, flats, and forgings manufactured under AMS 5510.

Caption: 303 Stainless Steel Plate – AISI 303 Grade, High-Quality Free-Machining Stainless Steel

Main Applications

Aircraft & piston engine exhaust systems – collector rings, flame tubes
Furnace plates & baffles – radiant tubes, muffles, baskets
Thermal oxidizer shells – flare stacks, reactor liners
Refinery flare stacks – high-temperature ducting
Expansion bellows – welded joints, flexible joints
High-temperature heat exchangers – tubesheets, shells
Superheater tubesheets – power station boilers
Chemical process vessels – operating 500–900 °C

Caption: 303 Stainless Steel Plate – 1.4305 / S30300 Grade, Manufacturers & Suppliers

Why Choose Us – High-Temp Specialist

PED 2014/68/EU & TUV certified mill – EN 10204 3.1 & 3.2 MTC supplied
In-house solution annealing furnace up to 1200 °C – full metallurgical control
200 000 tons annual capacity – 5-day lead time for standard sizes
Same-day plasma/laser cutting – tolerances ±0.2 mm, beveling included
Full NDT service – UT, RT, PMI on every 321 stainless steel plate
Real-time stock portal – 24/7 visibility for any 321 stainless steel plate sizes

Grade Comparison Table: 321 vs 304 vs 316 vs 310S vs 347 vs 321H

Grade/Type	Ti %	Mo %	Max Temp (°C)	Weld Post-Treat	Relative Cost	Best Use
321/321H	≥5×C	0	870	Not needed	1.1×	High-temp welded
304	0	0	800	Not needed	1.0× (base)	General service
316	0	2–3	870	Not needed	1.35×	Marine chloride
310S	0	0	1150	Not needed	1.4×	Furnace radiant
347	Nb≥10×C	0	870	Not needed	1.2×	Nuclear welded

FAQ – 321 Stainless Steel Plate

What is the current pricing?
Mill-direct FOB China USD 2.60–3.00/kg depending on nickel and titanium surcharge; fixed for 48 h.
Stock status for 20 mm plate?
5 000 t ready inventory; live portal updated every 30 minutes.
Difference 321 vs 321H?
321H has 0.04–0.10 % carbon for higher creep strength; 321 is ≤0.08 % for better formability.
Lead time for 50 mm × 2000 × 6000 mm?
7 days production + 3–5 days ocean freight to Asian ports; 10 days to EU/US warehouses.
Welding recommendations?
TIG with ER321 filler; pre-heat not required; post-weld anneal optional for most high-temp services.
China factory advantages?
Mill-direct pricing, 200 000 t capacity, in-house 1200 °C annealing, same-day cutting, full NDT.
Do you supply both plate and bar?
Yes, full range of 321 stainless steel bar or plate – rounds, flats, forgings under AMS 5510.
Do you export worldwide?
Yes, to 70+ countries including USA, Germany, India, UAE, South Korea, and Brazil.

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Stop paying trader margins. Contact the most trusted 321 stainless steel plate manufacturer today for the latest price, immediate access to massive 321 stainless steel plate for sale stock, and same-day cutting of any 321 stainless steel plate sizes.