EN 10088-3 X8CrNiS18-9 / 1.4305 Stainless Steel Bar
Material Number:1.4305/X8CrNiS18-9/AISI 303
Material Type:Austenitic Free-Machining Stainless Steel
Product Form:Round Bar, Flat Bar, Square Bar, Hexagonal Bar
Manufacturing Process:Hot Rolled, Cold Drawn, Peeled, Turned, Ground
Diameter Range:3–500 mm
Standard Length:2,000–6,000 mm
Customized Length:Available
Delivery Condition:Solution Annealed / Cold Worked
Surface Finish:Black, Bright, Peeled, Turned, Ground, Polished
Dimensional Tolerance:According to EN 10088-3 and agreed dimensional standards
EN 10088-3 X8CrNiS18-9 (1.4305) stainless steel bars Manufacturer
If you require stainless steel bars that offer stable cutting performance, excellent chip-breaking characteristics, and superior surface quality for the high-volume production of precision components, then the free-machining stainless steel grade X8CrNiS18-9 (1.4305)-compliant with the EN 10088-3 standard-is an ideal choice. Metallurgically optimized, this material is designed to help you effectively reduce production costs per unit.
AISI 303 stainless steel bars represent the best-performing austenitic stainless steel for machining. Through precise control of sulfur content (0.15%–0.35%), manganese sulfide inclusions are formed and dispersed throughout the material; during the cutting process, these inclusions facilitate internal chip-breaking and provide lubrication. Compared to conventional 1.4301 (304) grade bars, 1.4305 stainless steel rounds allow for an increase in cutting speeds of approximately 60%–80%, significantly extend tool life, and yield a superior surface finish. Furthermore, the material retains sufficient corrosion resistance for use in indoor settings, atmospheric environments, and mildly aqueous conditions.
In the annealed (+AT) delivery condition, the material exhibits a tensile strength of 500–750 MPa, a 0.2% proof stress (yield strength) of ≥ 190 MPa, an elongation of ≥ 35%, and a maximum hardness of 230 HBW. Its stable, non-magnetic austenitic microstructure makes it highly suitable for cold forming and subsequent precision finishing operations.
We supply EN 10088-3 X8CrNiS18-9 (1.4305) stainless steel bars in a variety of surface finishes, including hot-rolled ("black" bars), peeled/turned, cold-drawn ("bright" bars), and centerless-ground. Available in diameters ranging from 3 mm to 200 mm, with standard lengths of 3–6 meters; custom-cut lengths are also available upon request. Furthermore, we can supply hexagonal bars, square bars, and various custom-profile shapes in the 1.4305 grade to meet your specific requirements.
We issue fully traceable EN 10204 3.1 MTC mill certificates linked to each heat number, and support third-party witness inspection by SGS, BV and TÜV for quality system audits.
Equivalent Materials for 1.4305 Stainless Steel
| System | Designation |
| EN / DIN | X8CrNiS18-9 / 1.4305 |
| AISI / ASTM | 303 |
| UNS | S30300 |
| JIS | SUS 303 |
| BS (old) | 303S31 |
| AFNOR | Z8CNS17-12 |
Chemical Properties:
| % | Cr | Ni | C | Si | Mn | P | S | Mo | Fe |
|---|---|---|---|---|---|---|---|---|---|
| 303 | min: 17.0 max:19.0 |
min: 8.0 max: 10.0 |
0.15 max |
1.00 max |
2.0 max |
0.20 max |
0.15 min |
0.75 | balance |
Mechanical Properties:
| Grade | Tensile Strength ksi (min.) |
Yield Strength 0.2% Offset ksi (min.) |
Elongation - % in 50 mm (min.) |
Hardness (Brinell) MAX |
Hardness (Rockwell B) MAX |
|---|---|---|---|---|---|
| 303 | 75 | 30 | 35 | 228 |
Physical Properties:
| Denstiy lbm/in3 |
Coefficient of Thermal Expansion (min/in)-°F |
Electrical Resistivity mW-in | Thermal Conductivity BTU/hr-ft-°F | Melting Range |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| at 68 °F | at 68 – 212°F | at 68 – 932°F | at 68 – 1450°F | at 68°F | at 212°F | at 392°F | at 752°F | at 1112°F | at 1472°F | at 68 – 212°F | |
| 0.29 | 9.2 | 10.4 | 10.9 | 28.3 | 30.7 | 33.8 | 39.4 | 43.7 | 47.6 | 113.2 | 2552°F |
Tolerance for 303 Cold Drawn Round Bar
| Size(mm) | Tolerance Rank | |||||
| H8 | H9 | H10 | H11 | H12 | H13 | |
| 3 | 0~-0.014 | 0~-0.025 | 0~-0.040 | 0~-0.060 | 0~-0.10 | 0~-0.14 |
| 3 ~ 6 | 0~-0.018 | 0~-0.030 | 0~-0.048 | 0~-0.075 | 0~-0.12 | 0~-0.18 |
| 6 ~ 10 | 0~-0.022 | 0~-0.036 | 0~-0.058 | 0~-0.090 | 0~-0.15 | 0~-0.22 |
| 10 ~ 18 | 0~-0.027 | 0~-0.043 | 0~-0.070 | 0~-0.11 | 0~-0.18 | 0~-0.27 |
| 18 ~ 30 | 0~-0.033 | 0~-0.052 | 0~-0.084 | 0~-0.13 | 0~-0.21 | 0~-0.33 |
| 30 ~ 50 | 0~-0.039 | 0~-0.062 | 0~-0.10 | 0~-0.16 | 0~-0.25 | 0~-0.39 |
| 50 ~ 80 | 0~-0.046 | 0~-0.074 | 0~-0.12 | 0~-0.19 | 0~-0.30 | 0~-0.46 |
What are the main differences between 1.4305 (303) and 1.4301 (304) stainless steel bars?
The 1.4305 grade contains a controlled amount of sulfur, which significantly improves its machinability, chip-breaking characteristics, and tool life. While the 1.4301 (304) grade offers superior corrosion resistance, it has a slower machining speed. For high-volume production in relatively mild environments, 1.4305 is the recommended choice; conversely, if the application requires higher corrosion resistance and involves lower production volumes, 304 is a better option.
Are 1.4305 stainless steel bars suitable for welding?
1.4305 is not recommended for applications that require extensive welding. The sulfur content can lead to hot cracking in the weld zone. This grade is primarily intended for machined parts that are joined using mechanical fasteners. If welding is required, grades such as 304L or 316L would be more appropriate.
EN 10088-3 X8CrNiS18-9 / 1.4305 Stainless Steel Bar HS Code
|
Product Description |
HS Code (6-digit) |
Classification |
|---|---|---|
|
Hot-Rolled 1.4305 Stainless Steel Round Bar |
7222.11 |
Hot-rolled stainless steel bars, circular cross-section |
|
Hot-Rolled 1.4305 Stainless Steel Flat / Square Bar |
7222.19 |
Other hot-rolled stainless steel bars |
|
Cold-Drawn 1.4305 Stainless Steel Round Bar |
7222.20 |
Cold-formed or cold-finished stainless steel bars |
|
Peeled / Turned / Further-Processed 1.4305 Bar |
7222.30 |
Other stainless steel bars |
1.4305 Stainless Steel Bar Price List 2026
|
Diameter (mm) |
Surface Finish / Processing |
Estimated Price (USD/kg) |
Estimated Price (USD/MT) |
|---|---|---|---|
|
EN 10088-3 X8CrNiS18-9 / 1.4305 |
Cold Drawn / Bright |
$2.00–2.50 |
$2,000–2,500 |
|
Cold Drawn / Peeled |
$2.10–2.60 |
$2,100–2,600 |
|
|
Peeled / Turned |
$2.20–2.80 |
$2,200–2,800 |
|
|
Hot Rolled / Turned |
$2.10–2.70 |
$2,100–2,700 |
|
|
Forged / Rough Turned |
$2.30–2.90 |
$2,300–2,900 |
|
|
Forged / Customized |
$2.50–3.30 |
$2,500–3,300 |
Quality Inspection
Every production batch undergoes mandatory inspection per EN 10088-3 requirements: spectroscopic chemical analysis to verify sulphur and alloy content, room-temperature tensile test, Brinell hardness verification, surface visual and dimensional inspection, and PMI positive material identification per heat lot. Supplementary tests available for project orders include ultrasonic testing for internal soundness, magnetic permeability check and surface roughness measurement.
Lead time and packaging:
standard hot-rolled and cold drawn stock sizes ship within 7–12 working days; peeled, ground or custom-cut bars require 14–22 working days. Bars are protected with end caps, wrapped in anti-rust paper, bundled with steel strapping and packed on fumigated wooden pallets or in wooden crates for ocean shipment, clearly marked with grade, material number, heat number, diameter and EN 10088-3 for full receiving traceability.
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