1.4306 Stainless Steel Purchasing Considerations
What is the 1.4306 material?
1.4306 (EN X2CrNi19-11, UNS S30403) is a low-carbon, high-nickel austenitic stainless steel often regarded as a high-purity version of 304L. The higher nickel content (10-12%, versus 8-10.5% for 1.4307) improves corrosion resistance, particularly in mildly aggressive media. It is widely used in pharmaceutical, chemical, food and high-hygiene industries because of its excellent weldability and corrosion resistance.
1. Grade Verification
Standard: EN 10088-1, material number 1.4306
Equivalent grades: AISI 304L (high-nickel variant), UNS S30403
Difference from 1.4307: 1.4306 has higher nickel (10-12% versus 8-10.5%), improving corrosion resistance and stabilizing austenite
Always request a mill test certificate (EN 10204 3.1 or 3.2) to confirm compliance with the specified standard
2. Product Forms and Finishes
Common forms are cold-rolled sheets, seamless and welded pipes, round bars, coils and sanitary tubes. Typical finishes include 2B, BA, No.4 and polished surfaces; for pharmaceutical and hygienic use, specify Ra ≤ 0.8 μm or electropolishing. Sheet thickness is typically 0.3-50 mm depending on form.
3. Corrosion Resistance Requirements
1.4306 suits mild chloride exposure (food ingredients), and low to medium acid exposure such as citric and lactic acids. It is not suitable for high-chloride, coastal or marine environments, nor for reducing acids such as hydrochloric acid. For more aggressive environments, consider 1.4404 (316L) or 1.4435.
4. Welding and Fabrication
Weldability is excellent due to the low carbon content (≤ 0.030%). No post-weld heat treatment is required, the risk of sensitization and intergranular corrosion is minimal, and TIG, MIG and laser processes are all suitable. Where welded joints are critical, 1.4306 gives cleaner weld zones than 1.4307.
5. Cost Factors
1.4306 is typically more expensive than 1.4307 because of the higher nickel content. Actual cost varies with global nickel market trends, product form and finish, order quantity and logistics. Evaluate grade alternatives (1.4307 for lower cost, 1.4404 for better corrosion resistance) against the end-use requirements.
6. Certification and Compliance
Request documentation for EN 10088-1 / EN 10204 compliance, food-contact regulations (e.g., EU 10/2011 or FDA as applicable), and confirm traceability for cleanroom or hygienic applications. Confirm the required finish quality and mechanical properties with the supplier before ordering.
To provide you with more precise purchasing recommendations, please specify:
The specific product form (e.g., plate, wire, seamless pipe, flange)?
The chemical media or temperature conditions your equipment is primarily exposed to?
Your procurement volume and delivery location?
FAQ
Q: What is the difference between 1.4306 and 1.4307?
A: Both 1.4306 and 1.4307 are low-carbon austenitic stainless steels related to the standard 304/304L grades; however, 1.4306 has a higher nickel content (10%–12% versus 8%–10.5%), resulting in superior corrosion resistance compared to 1.4307.
Q: Does 1.4306 need post-weld heat treatment?
A: No, EN 1.4306 (an austenitic stainless steel similar to 304L) has excellent weldability and does not require post-weld heat treatment (PWHT) under normal conditions.
Q: Is 1.4306 suitable for marine environments?
A: NNo, 1.4306 is generally not suitable for direct exposure to marine environments.Material 1.4306 (commonly known as AISI 304L) lacks molybdenum, an essential alloying element required to resist chloride-induced pitting and crevice corrosion found in saltwater and coastal air.
