Womic Stainless Steel Co., Ltd
Good Corrosion Resistance: Excellent resistance to oxidation and corrosion in fresh water, mild chemical media, atmospheric conditions, and food products. The 304L grade provides additional protection against intergranular corrosion after welding.
Cost-Effective Solution: Lower alloy content (no molybdenum) compared to 316/316L makes 304/304L a more economical choice for applications where chloride-induced pitting is not a concern.
Superior Formability: 304/304L stainless steel offers excellent forming characteristics for bending, punching, drilling, and shearing operations.
High Mechanical Strength: Good tensile and yield strength with excellent ductility for load-bearing structural applications.
Superior Weldability: 304L grade ensures low carbon content for superior weld performance, with reduced risk of intergranular corrosion in welded fabrications.
Precision Dimensional Tolerances: Tight thickness and width tolerances (EN 10058, DIN 593, ASTM A484) ensure consistent material for fabrication.
Square Edges: Precision-rolled square edges for accurate fitting and welding.
Smooth Surface Quality: Available in black (hot-rolled), pickled, and polished finishes for various industrial and architectural applications.
International Certifications: Flat bars can be certified by ABS, BV, DNV, LR, GL, RINA, CCS, KR, and NK, and comply with ASME, ASTM, EN, and JIS standards.
|
Standard |
Description |
Corresponding 304/304L Grade |
|
ASTM A276 / A479 |
Standard specification for stainless steel bars and shapes |
304 / 304L |
|
ASTM A484 |
General requirements for stainless steel bars and shapes |
304 / 304L |
|
EN 10058 |
European standard for hot-rolled flat steel bars |
1.4301 / 1.4307 |
|
EN 10088-3 |
European standard for stainless steel bars for general purposes |
1.4301 / 1.4307 |
|
JIS G4303 |
Japanese standard for stainless steel bars |
SUS304 / SUS304L |
|
JIS G4318 |
Japanese standard for cold-finished stainless steel bars |
SUS304 / SUS304L |
|
GB/T 1220 |
Chinese standard for stainless steel bars |
06Cr19Ni10 / 022Cr19Ni10 |
|
DIN 593 |
German standard for flat steel bars |
1.4301 / 1.4307 |
|
Element |
C |
Mn |
P |
S |
Si |
Cr |
Ni |
|
304 Flat Bars |
≤0.08 |
≤2.00 |
≤0.045 |
≤0.030 |
≤1.00 |
18.0–20.0 |
8.0–11.0 |
|
304L Flat Bars |
≤0.03 |
≤2.00 |
≤0.045 |
≤0.030 |
≤1.00 |
18.0–20.0 |
8.0–12.0 |
The lower carbon content in 304L minimizes carbide precipitation during welding, providing enhanced resistance to intergranular corrosion compared to standard 304, especially in welded fabrications.
|
Property |
Unit |
304 (Annealed) |
304L (Annealed) |
|
Tensile Strength |
MPa |
≥515 |
≥485 |
|
Yield Strength (0.2% offset) |
MPa |
≥205 |
≥170 |
|
Elongation |
% |
≥40 |
≥40 |
|
Hardness (Brinell) |
HBW |
≤201 |
≤201 |
|
Density |
g/cm³ |
7.93 |
7.93 |
|
Melting Range |
°C |
1400–1450 |
1400–1450 |
|
Modulus of Elasticity |
GPa |
193 |
193 |
|
Coefficient of Thermal Expansion (20–100°C) |
μm/m·K |
17.2 |
17.2 |
Heat Treatment Condition:
Both 304 and 304L stainless steel flat bars are normally supplied in the annealed
condition. Solution annealing at 1010–1080°C followed by rapid cooling
(water quenching) restores full corrosion resistance and ensures optimal
ductility.
Delivery Condition Options:
Black (Hot-Rolled): As-rolled with mill scale – for general structural applications
Pickled: Acid-treated, oxide-free surface – for welding and fabrication
Polished: Mechanically polished, smooth finish – for architectural and decorative applications
Standard Thickness Ranges:
|
Thickness (mm) |
Width Range (mm) |
Tolerance (mm) |
|
3 – 6 |
12 – 100 |
±0.2 |
|
6 – 10 |
20 – 150 |
±0.3 |
|
10 – 20 |
30 – 200 |
±0.4 |
|
20 – 30 |
40 – 250 |
±0.5 |
|
30 – 50 |
50 – 300 |
±0.7 |
Standard Width Ranges:
|
Width (mm) |
Tolerance (mm) |
|
12 – 50 |
±0.5 |
|
50 – 100 |
±0.8 |
|
100 – 200 |
±1.0 |
|
200 – 300 |
±1.5 |
Standard Lengths:
3000mm (3 meters)
6000mm (6 meters)
Custom lengths available upon request
Straightness Tolerances:
Standard: 2mm per meter
Precision: 1mm per meter (upon request)
|
Dimensions (mm) |
Weight (kg/m) |
Dimensions (mm) |
Weight (kg/m) |
|
20 x 3 |
0.48 |
60 x 10 |
4.76 |
|
20 x 4 |
0.64 |
60 x 12 |
5.71 |
|
25 x 3 |
0.60 |
65 x 8 |
4.12 |
|
25 x 4 |
0.79 |
65 x 10 |
5.16 |
|
25 x 5 |
0.99 |
70 x 6 |
3.33 |
|
30 x 3 |
0.71 |
70 x 8 |
4.44 |
|
30 x 4 |
0.95 |
70 x 10 |
5.56 |
|
30 x 5 |
1.19 |
75 x 8 |
4.76 |
|
30 x 6 |
1.43 |
75 x 10 |
5.95 |
|
40 x 4 |
1.27 |
80 x 8 |
5.08 |
|
40 x 5 |
1.59 |
80 x 10 |
6.35 |
|
40 x 6 |
1.90 |
80 x 12 |
7.62 |
|
40 x 8 |
2.54 |
100 x 8 |
6.35 |
|
50 x 5 |
1.98 |
100 x 10 |
7.93 |
|
50 x 6 |
2.38 |
100 x 12 |
9.52 |
|
50 x 8 |
3.17 |
100 x 15 |
11.90 |
|
50 x 10 |
3.97 |
120 x 10 |
9.52 |
|
60 x 5 |
2.38 |
120 x 12 |
11.43 |
|
60 x 6 |
2.86 |
120 x 15 |
14.29 |
|
60 x 8 |
3.81 |
150 x 12 |
14.29 |
*Formula: Weight (kg/m) = Width (mm) × Thickness (mm) × 0.00793*
|
Surface Finish |
Code |
Description |
Typical Applications |
|
Black (Hot-Rolled) |
HR |
As-rolled with mill scale, dark surface |
General structural, embedded applications |
|
Pickled |
P |
Acid-treated, oxide-free, matte silver finish |
Welded fabrications, food equipment |
|
Polished |
PL |
Mechanically polished, smooth, reflective finish |
Architectural trim, handrails |
|
Brushed (Hairline) |
HL |
Linear brushed finish, satin appearance |
Decorative architectural, furniture |
|
Mirror Polished |
MP |
Highly reflective, mirror-like finish |
Sanitary equipment, decorative trim |
Raw Material Selection: High-quality 304/304L stainless steel billets from certified mills with certified chemical composition and traceability.
Heating: Billets heated to 1150–1250°C in reheating furnaces.
Hot Rolling: Heated billets passed through roughing and finishing stands to form flat bar shape with precise width and thickness.
Cooling: Controlled cooling to prevent surface defects and ensure uniform microstructure.
Annealing: Solution annealing at 1010–1080°C to restore corrosion resistance and ductility.
Pickling: Removal of oxide scale using mixed acid (HNO₃ + HF) for pickled finish.
Straightening: Roller straightening to ensure straightness tolerance within 2mm per meter.
Cutting: Cut to standard lengths (3000mm or 6000mm) using cold saws.
Surface Finishing (Optional): Polishing or brushing applied upon request.
Inspection & Testing: Dimensional check, PMI, mechanical testing, surface inspection.
Marking & Packing: Each bundle tagged with grade, heat number, dimensions, and standard.
Chemical Analysis: Spectrometer verification or PMI for alloy elements (Cr 18-20%, Ni 8-12%).
Mechanical Testing: Tensile strength, yield strength, elongation, hardness per ASTM A370.
Dimensional Inspection: Thickness, width, length, straightness, squareness.
Surface Inspection: Visual check for surface defects, cracks, seams, and laps.
Edge Inspection: Check for square edges, burrs, and cracks.
Ultrasonic Testing (UT): Upon request.
Intergranular Corrosion Test: ASTM A262 Practice E for 304L (upon request).
Third-Party Inspection: SGS, BV, DNV, TUV, LR, ABS available.
General Industrial Frameworks: Equipment frames, machine bases, conveyor supports, workbench frames, storage rack supports.
Handrail Brackets: Handrail mounting brackets, balustrade supports, guardrail brackets, stair rail brackets.
Food Processing Equipment: Conveyor frame supports, equipment legs, guide rails, table frames, workbench supports, dairy equipment frames.
Pharmaceutical Equipment: Cleanroom framework supports, equipment stands, instrument mounting brackets, sanitary equipment frames.
Architectural Trim: Door frames, window trim, curtain wall frames, decorative grilles, base plates, threshold plates.
Machinery Components: Machine frames, guide rails, support brackets, mounting plates, fixture components.
HVAC Equipment: Fan bases, compressor supports, duct hangers, equipment mounting brackets.
Automotive Components: Trailer frames, truck body components, equipment mounting brackets.
Construction: Building framework supports, structural stiffeners, foundation bolts, anchor plates.
General Fabrication: Brackets, gussets, stiffeners, reinforcement plates, base plates, shims.
1. What is the difference between 304 and 304L stainless
steel flat bars?
The main difference is carbon content. 304L has lower carbon (≤0.03% vs
≤0.08%), which prevents carbide precipitation during welding and provides
better resistance to intergranular corrosion. For welded fabrications, 304L is
typically preferred.
2. Can 304 flat bars be used in marine environments?
No. For seawater or high-chloride environments, 316/316L or duplex stainless
steel flat bars should be used. 304/304L is not suitable for marine
applications.
3. What are the standard lengths for stainless steel flat
bars?
Standard lengths are 3000mm (3 meters) and 6000mm (6 meters). Custom lengths up
to 12000mm are available upon request.
4. What is the difference between black and pickled flat
bars?
Black (hot-rolled) flat bars have mill scale on the surface and are suitable
for general structural applications where surface appearance is not critical.
Pickled flat bars have the mill scale removed by acid treatment, providing a
clean, oxide-free surface ideal for welding and fabrication.
5. What is the maximum temperature for continuous service?
800°C (1472°F) for 304 and 304L. For intermittent service, up to 850°C
(1562°F).
6. Do you provide material test reports (MTR) and
certification?
Yes, every shipment includes EN 10204 Type 3.1 MTR with chemical analysis and
mechanical properties. Third-party inspection available upon request.
Cost-Effective: Most economical stainless steel flat bar option for general service
Complete Size Range: Thickness from 3mm to 50mm, width from 12mm to 300mm – all standard sizes in stock
Multiple Surface Finishes: Black, pickled, polished, brushed, mirror – all available
Precision Tolerances: EN 10058, DIN 593, ASTM A484 compliant
Square Edges: Precision-rolled for accurate fabrication
Full Traceability: Heat number on each bundle – traceable to original mill certificate
Large Inventory: Over 2,000 tons in stock – ready for immediate dispatch
Custom Cutting: Cut to exact lengths per order
Global Delivery: Exported to over 50 countries
Website: www.womicstainless.com
E-mail: info@womicstainless.com
Tel / WhatsApp / WeChat:
Victor: +86 15575100681
Jack: +86 18390957568
Womic Steel – Your reliable partner for high‑quality stainless steel products, precision machined components, and custom solutions for corrosion‑resistant applications.
Stock Examples (304L Stainless Steel Flat Bars – Pickled Finish – Industrial Grade):
|
Dimensions (mm) |
Length |
Weight (kg/m) |
Typical Application |
|
30 x 5 |
6000mm |
1.19 |
Light equipment brackets |
|
40 x 6 |
6000mm |
1.90 |
Support brackets |
|
50 x 6 |
6000mm |
2.38 |
Conveyor frames |
|
60 x 8 |
6000mm |
3.81 |
Machine bases |
|
75 x 10 |
6000mm |
5.95 |
Equipment frames |
|
100 x 10 |
6000mm |
7.93 |
Structural supports |
|
120 x 12 |
6000mm |
11.43 |
Heavy industrial frames |
Stock Examples (304L Stainless Steel Flat Bars – Polished Finish – Architectural Grade):
|
Dimensions (mm) |
Length |
Weight (kg/m) |
Typical Application |
|
20 x 3 |
3000mm |
0.48 |
Handrail brackets |
|
25 x 4 |
3000mm |
0.79 |
Balustrade supports |
|
30 x 4 |
3000mm |
0.95 |
Door frames |
|
40 x 5 |
3000mm |
1.59 |
Window trim |
|
50 x 6 |
3000mm |
2.38 |
Curtain wall frames |
Stock Examples (304 Stainless Steel Flat Bars – Black – General Industrial):
|
Dimensions (mm) |
Length |
Weight (kg/m) |
Typical Application |
|
40 x 5 |
6000mm |
1.59 |
Machine bases |
|
50 x 6 |
6000mm |
2.38 |
Conveyor frames |
|
60 x 10 |
6000mm |
4.76 |
Heavy machinery supports |
|
80 x 12 |
6000mm |
7.62 |
Structural frameworks |
Related Keywords:
304 stainless steel flat bar, 304L stainless steel flat bar, stainless steel flat bar sizes, pickled stainless steel flat bar, polished stainless steel flat bar, stainless steel flat bar for handrail, structural stainless steel flat bar, ASTM A479 304L flat bar, EN 10058 stainless steel flat bar, JIS G4303 SUS304 flat bar, 304 stainless steel flat bar weight chart, stainless steel flat bar for bracketry, stainless steel flat bar for equipment supports, stainless steel flat bar for conveyor frames, stainless steel flat bar for machine bases, pickled and passivated stainless flat bar, square edge stainless flat bar, 304L flat bar for food processing equipment, stainless steel flat bar cut to length, stainless steel flat bar for architectural trim, cost effective stainless flat bar.
