AISI 303 Austenitic Edelstahl: Free-Machining Grade
ASTM A582/A895 · Published: 2026-06-02 · Updated: July 2026
AISI 303 is the free-machining version of 304, with 0.15-0.35% sulfur added to break chips and lubricate the cutting tool—improving machinability by approximately 40% over 304. However, the sulfur addition significantly degrades corrosion...
AISI 303 ist der kostenlos-machining version von 304, mit 0.15-0.35% sulfur added zu break chips und lubricate der cutting werkzeug—improving machinability durch approximately 40% über 304. However, der sulfur addition significantly degrades corrosion widerstand (especially pitting widerstand), formability, und weldability—303 ist nicht recommended für welding due zu heiß cracking von niedrig-melting-point sulfide phases bei grain boundaries. Used für nuts, bolts, bushings, fittings, und shafts produced in hoch volumes ein automatic screw machines wo machinability ist der primär kosten fahrer. Für applications requiring beide machinability und weldability, consider 304L mit optimized machining parameters instead.
Quick Facts
| Kategorie | Edelstahl |
| Norm | ASTM A582/A895 |
| Density | 8.00 g/cm³ |
| Yield Strength | 240 MPa (35 ksi) |
| Tensile Strength | 585 MPa (85 ksi) |
Global Equivalents & Cross-Reference
| Alternative Standard / Grade | Action |
|---|---|
| EN 1.4305 | Compare |
| X8CrNiS18-9 | Compare |
| SUS303 | Compare |
| Y1Cr18Ni9 | Compare |
Verwandt Materials
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Frequently Asked Questions
Warum können't 303 sein welded?
Der sulfur added für machinability forms niedrig-melting-point manganese sulfide stringers bei grain boundaries. Während welding, diese sulfides melt und cause heiß cracking (solidification cracking) in der weld metal und HAZ. Für applications requiring welding, verwenden 304/304L und accept der reduced machinability. Dort ist nein kostenlos-machining austenitic stainless steel mit acceptable weldability.
References & International Standards
- ASTM International. Norm Specifications für Stahl & Metal Alloys. astm.org
- International Organization für Standardization (ISO). Metallic Materials — Cross-Referenz Database. iso.org
- American Iron und Stahl Institute (AISI). Stahl Güte Designations & Equivalents. steel.org
- European Committee für Standardization (CEN). EN Stahl Standards & Numbering System. cencenelec.eu