Why Identifying SA 240 GR 304 is Important
SA 240 GR 304 is prized for its SS 304 non magnetic properties, excellent corrosion resistance, and formability, with a SA 240 GR 304 density of 8.00 g/cm³. Misidentifying it with grades like SA 240 GR 304L or SA 240 GR 316 can lead to performance issues or cost overruns. Proper identification ensures compliance with ASME SA 240 standards and suitability for your project. Gangsteel’s sa 240 gr 304 plates are certified for quality.
Methods to Identify SA 240 GR 304 Stainless Steel
Here are practical ways to confirm if a material is SA 240 GR 304:
1. Check Material Certification and Markings
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Mill Test Certificate (MTC): Request the MTC from the supplier, which details the chemical composition, mechanical properties, and ASME SA 240 compliance. SA 240 GR 304 has 18-20% chromium and 8-10.5% nickel, per our SS 304 data sheet.
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Surface Markings: Plates like plat SS 304 3mm often have stamped or laser-etched markings indicating “SA 240 GR 304” or “304 SS.” Gangsteel ensures clear labeling on all sa 240 gr 304l and 304 products.
2. Magnet Test
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SA 240 GR 304 is SS 304 non magnetic in its annealed state. Use a magnet to test: if it doesn’t stick, it’s likely 304 or another austenitic grade like SA 240 GR 316. Note: Cold-worked 304 may show slight magnetism, so this isn’t conclusive alone.
3. Chemical Composition Analysis
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Portable XRF Analyzer: Use a handheld X-ray fluorescence (XRF) device to verify the composition (Cr: 18-20%, Ni: 8-10.5%, C: ≤0.08%). This distinguishes SA 240 GR 304 from SA 240 GR 304H material (higher carbon) or SS204 vs SS 304 (lower nickel).
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Spark Test: In workshops, a spark test shows short, reddish sparks for 304, unlike ferritic grades. Gangsteel provides sa 240 gr 304h for comparison.
4. Visual and Physical Inspection
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Appearance: SA 240 GR 304 has a smooth, shiny finish (e.g., 2B or No.1) typical of plat stainless 304. It resists rust in mild environments, unlike lower-grade alloys.
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Density Check: With a SA 240 GR 304 density of 8.00 g/cm³, calculate weight (e.g., a 1m x 1m x 3mm plate weighs ~24 kg) to rule out denser or lighter metals.
5. Mechanical Property Testing
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Test for tensile strength (≥515 MPa), yield strength (≥205 MPa), and elongation (≥40%) as per ASME SA 240. These align with SA 240 GR 304 mechanical properties but differ from SA 240 GR 316 or SA 240 GR 317l. Refer to our sa 240 gr 316l for comparison.
6. Corrosion Resistance Test
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Expose a sample to mild acid (e.g., vinegar). SA 240 GR 304 resists corrosion well, unlike lower-grade stainless steels. For chloride environments, consider our sa 240 gr 317.
Common Mistakes to Avoid
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Confusing with 304L: SA 240 GR 304L has lower carbon (≤0.03%) for better weldability. Use chemical analysis to differentiate.
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Assuming All Non-Magnetic is 304: Other austenitic grades like SA 240 GR 316 are also non-magnetic. Verify with MTC or XRF.
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Ignoring Cold Work: Cold-rolled SA 240 GR 304 may appear slightly magnetic, so combine tests.
Why Choose Gangsteel for SA 240 GR 304?
Gangsteel ensures accurate identification with certified sa 240 gr 304 plates, competitive SS 304 plate price, and detailed documentation like SA 240 TP 304 PDF. Our inventory includes SA 240 GR 304 pipe and custom sizes like plate 2 mm SUS 304. For related grades, explore sa 240 gr 321 or astm a 240 stainless plate.
Conclusion
Identifying SA 240 GR 304 involves checking certifications, magnet tests, chemical analysis, and physical properties. With Gangsteel’s expertise, you can trust our SA 240 TP 304/304L plates for quality and compliance. Need help or a quote? Email admin@gangsteel.com or visit our ASME SA 240 stainless steel plate page today.
