{"title":"Partially Threaded Hexagon Bolts (DIN 931) — Duplex 2205 Stainless Steel","description":"\u003ch1\u003ePartially Threaded Hexagon Bolts (DIN 931) — Duplex 2205 Stainless Steel\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG DIN 931 Duplex 2205 partially threaded hexagon bolts are manufactured from UNS S31803 \/ S32205 duplex stainless steel, with a whitened and passivated surface finish. Duplex 2205 is a two-phase (austenite + ferrite) stainless steel that delivers approximately twice the yield strength of standard austenitic grades (A2\/A4) while simultaneously providing superior resistance to chloride stress corrosion cracking (SCC), pitting, and crevice corrosion — making these bolts the premier choice for the most demanding offshore, marine, chemical, and subsea structural applications.\u003c\/p\u003e\n\n\u003cp\u003eThe partially threaded shank — with a smooth unthreaded grip length beneath the head — provides precise shear load transfer through the bolt body, making DIN 931 the preferred choice for structural connections, flanged joints, and machinery where the bolt passes through clearance holes and the thread engages only in the nut or tapped hole.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStandard\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDIN 931 ≡ ISO 4014 (Partially Threaded Hexagon Head Bolts)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThread\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMetric coarse per ISO 261 \/ DIN 13\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThread Coverage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePartial thread — unthreaded grip length beneath head\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHead Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHexagon head — driven by open-end wrench, ring spanner, or socket\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDuplex 2205 Stainless Steel \/ UNS S31803 \/ S32205 \/ 1.4462\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMicrostructure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDuplex (austenite + ferrite, ~50\/50) — combines strength of ferritic with corrosion resistance of austenitic\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface Finish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWhitened \u0026amp; Passivated\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eM6 – M36 (standard); larger sizes on request\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLength Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25 mm – 300 mm (size-dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePREN\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≥ 34 (typically ~38–40) — significantly higher than A4 SUS316 (~24–26)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eKey Advantage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~2× yield strength of A4-70 + superior SCC \u0026amp; pitting resistance — the premium choice for aggressive environments\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelated Standard\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eASTM A193 B7M  |  NACE MR0175 \/ ISO 15156  |  ISO 4014  |  EN 10088\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Gallery\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"width:25%; text-align:center; padding:12px;\"\u003e[Product Photo 1]\u003c\/td\u003e\n      \u003ctd style=\"width:25%; text-align:center; padding:12px;\"\u003e[Product Photo 2]\u003c\/td\u003e\n      \u003ctd style=\"width:25%; text-align:center; padding:12px;\"\u003e[Product Photo 3]\u003c\/td\u003e\n      \u003ctd style=\"width:25%; text-align:center; padding:12px;\"\u003e[Product Photo 4]\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eHead Dimensions — DIN 931 \/ ISO 4014\u003c\/h2\u003e\n\u003cp\u003eAll dimensions in millimeters (mm). Data per DIN 931 \/ ISO 4014 standard.\u003c\/p\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eThread (d)\u003c\/th\u003e\n      \u003cth\u003ePitch (mm)\u003c\/th\u003e\n      \u003cth\u003es — A\/F (mm)\u003c\/th\u003e\n      \u003cth\u003ee — A\/C (mm)\u003c\/th\u003e\n      \u003cth\u003ek — Head Height (mm)\u003c\/th\u003e\n      \u003cth\u003eds — Shank Ø (mm)\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003e11.05\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e5.7\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e1.25\u003c\/td\u003e\n\u003ctd\u003e13\u003c\/td\u003e\n\u003ctd\u003e14.38\u003c\/td\u003e\n\u003ctd\u003e5.3\u003c\/td\u003e\n\u003ctd\u003e7.64\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e17\u003c\/td\u003e\n\u003ctd\u003e18.90\u003c\/td\u003e\n\u003ctd\u003e6.4\u003c\/td\u003e\n\u003ctd\u003e9.64\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e1.75\u003c\/td\u003e\n\u003ctd\u003e19\u003c\/td\u003e\n\u003ctd\u003e21.10\u003c\/td\u003e\n\u003ctd\u003e7.5\u003c\/td\u003e\n\u003ctd\u003e11.57\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM14\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e22\u003c\/td\u003e\n\u003ctd\u003e24.49\u003c\/td\u003e\n\u003ctd\u003e8.8\u003c\/td\u003e\n\u003ctd\u003e13.57\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e24\u003c\/td\u003e\n\u003ctd\u003e26.75\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e15.57\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM20\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e33.53\u003c\/td\u003e\n\u003ctd\u003e12.5\u003c\/td\u003e\n\u003ctd\u003e19.48\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM24\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e36\u003c\/td\u003e\n\u003ctd\u003e39.98\u003c\/td\u003e\n\u003ctd\u003e15.0\u003c\/td\u003e\n\u003ctd\u003e23.48\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM27\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e41\u003c\/td\u003e\n\u003ctd\u003e45.20\u003c\/td\u003e\n\u003ctd\u003e17.0\u003c\/td\u003e\n\u003ctd\u003e26.48\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM30\u003c\/td\u003e\n\u003ctd\u003e3.5\u003c\/td\u003e\n\u003ctd\u003e46\u003c\/td\u003e\n\u003ctd\u003e50.85\u003c\/td\u003e\n\u003ctd\u003e18.7\u003c\/td\u003e\n\u003ctd\u003e29.48\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM36\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e55\u003c\/td\u003e\n\u003ctd\u003e60.79\u003c\/td\u003e\n\u003ctd\u003e22.5\u003c\/td\u003e\n\u003ctd\u003e35.38\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003e* s = across flats (A\/F); e = across corners (A\/C); k = head height; ds = unthreaded shank diameter (max). All dimensions per DIN 931 \/ ISO 4014.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eThread Length (b) — DIN 931 Partial Thread Reference\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eThread (d)\u003c\/th\u003e\n      \u003cth\u003eb — L ≤ 125 mm\u003c\/th\u003e\n      \u003cth\u003eb — 125 \u0026lt; L ≤ 200 mm\u003c\/th\u003e\n      \u003cth\u003eb — L \u0026gt; 200 mm\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e18\u003c\/td\u003e\n\u003ctd\u003e24\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e22\u003c\/td\u003e\n\u003ctd\u003e28\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e26\u003c\/td\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003ctd\u003e45\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e36\u003c\/td\u003e\n\u003ctd\u003e49\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM14\u003c\/td\u003e\n\u003ctd\u003e34\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e53\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e38\u003c\/td\u003e\n\u003ctd\u003e44\u003c\/td\u003e\n\u003ctd\u003e57\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM20\u003c\/td\u003e\n\u003ctd\u003e46\u003c\/td\u003e\n\u003ctd\u003e52\u003c\/td\u003e\n\u003ctd\u003e65\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM24\u003c\/td\u003e\n\u003ctd\u003e54\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e73\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM27\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e66\u003c\/td\u003e\n\u003ctd\u003e79\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM30\u003c\/td\u003e\n\u003ctd\u003e66\u003c\/td\u003e\n\u003ctd\u003e72\u003c\/td\u003e\n\u003ctd\u003e85\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM36\u003c\/td\u003e\n\u003ctd\u003e78\u003c\/td\u003e\n\u003ctd\u003e84\u003c\/td\u003e\n\u003ctd\u003e97\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003e* b = threaded length. Grip length = L − b − k (approximate). Per DIN 931 \/ ISO 4014.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eMaterial \u0026amp; Mechanical Properties — Duplex 2205\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaterial Designation\u003c\/td\u003e\n\u003ctd\u003eDuplex 2205 \/ UNS S31803 \/ S32205 \/ 1.4462\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMicrostructure\u003c\/td\u003e\n\u003ctd\u003eDuplex — ~50% austenite + ~50% ferrite\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eNominal Composition\u003c\/td\u003e\n\u003ctd\u003e22% Cr — 5% Ni — 3% Mo — 0.17% N\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTensile Strength (Rm)\u003c\/td\u003e\n\u003ctd\u003e≥ 620 MPa (min.) — typically 750–900 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e0.2% Proof Stress (Rp0.2)\u003c\/td\u003e\n\u003ctd\u003e≥ 450 MPa (min.) — typically 550–700 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eYield Strength advantage\u003c\/td\u003e\n\u003ctd\u003e~2× that of A2-70 \/ A4-70 austenitic grades\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHardness\u003c\/td\u003e\n\u003ctd\u003e≤ 310 HB \/ ≤ 32 HRC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eElongation at Break\u003c\/td\u003e\n\u003ctd\u003e≥ 25%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eImpact Toughness (Charpy)\u003c\/td\u003e\n\u003ctd\u003eGood — suitable down to −50°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePREN (Pitting Resistance)\u003c\/td\u003e\n\u003ctd\u003e≥ 34 (typically ~38–40) — vs ~24–26 for A4 SUS316\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eChloride SCC resistance\u003c\/td\u003e\n\u003ctd\u003eExcellent — far superior to austenitic grades (A2\/A4)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDensity\u003c\/td\u003e\n\u003ctd\u003e7.80 g\/cm³\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMagnetic\u003c\/td\u003e\n\u003ctd\u003eYes — ferrite phase makes duplex magnetic\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSurface Finish\u003c\/td\u003e\n\u003ctd\u003eWhitened \u0026amp; Passivated\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e−50°C to +250°C (continuous service; avoid prolonged use above 300°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDuplex 2205 vs A4 (SUS316) vs A2 (SUS304) — Full Comparison\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eDuplex 2205 (This Product)\u003c\/th\u003e\n      \u003cth\u003eA4-80 — SUS316\u003c\/th\u003e\n      \u003cth\u003eA4-70 — SUS316\u003c\/th\u003e\n      \u003cth\u003eA2-70 — SUS304\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMicrostructure\u003c\/td\u003e\n\u003ctd\u003eDuplex (austenite + ferrite)\u003c\/td\u003e\n\u003ctd\u003eAustenitic\u003c\/td\u003e\n\u003ctd\u003eAustenitic\u003c\/td\u003e\n\u003ctd\u003eAustenitic\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTensile Strength (Rm)\u003c\/td\u003e\n\u003ctd\u003e≥ 620 MPa (typ. 750–900)\u003c\/td\u003e\n\u003ctd\u003e≥ 800 MPa\u003c\/td\u003e\n\u003ctd\u003e≥ 700 MPa\u003c\/td\u003e\n\u003ctd\u003e≥ 700 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eProof Stress (Rp0.2)\u003c\/td\u003e\n\u003ctd\u003e≥ 450 MPa (typ. 550–700)\u003c\/td\u003e\n\u003ctd\u003e≥ 600 MPa\u003c\/td\u003e\n\u003ctd\u003e≥ 450 MPa\u003c\/td\u003e\n\u003ctd\u003e≥ 450 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eYield strength vs A4-70\u003c\/td\u003e\n\u003ctd\u003e~1.5× to 2× higher\u003c\/td\u003e\n\u003ctd\u003e~1.3× higher\u003c\/td\u003e\n\u003ctd\u003eBaseline\u003c\/td\u003e\n\u003ctd\u003eBaseline\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePREN\u003c\/td\u003e\n\u003ctd\u003e~38–40\u003c\/td\u003e\n\u003ctd\u003e~24–26\u003c\/td\u003e\n\u003ctd\u003e~24–26\u003c\/td\u003e\n\u003ctd\u003e~18–20\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eChloride pitting resistance\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003ctd\u003eModerate\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eChloride SCC resistance\u003c\/td\u003e\n\u003ctd\u003eExcellent — key advantage over austenitic\u003c\/td\u003e\n\u003ctd\u003eSusceptible at elevated temp.\u003c\/td\u003e\n\u003ctd\u003eSusceptible at elevated temp.\u003c\/td\u003e\n\u003ctd\u003eSusceptible\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCrevice corrosion\u003c\/td\u003e\n\u003ctd\u003eVery good\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003ctd\u003eModerate\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMagnetic\u003c\/td\u003e\n\u003ctd\u003eYes (ferrite phase)\u003c\/td\u003e\n\u003ctd\u003eSlightly (cold worked)\u003c\/td\u003e\n\u003ctd\u003eSlightly\u003c\/td\u003e\n\u003ctd\u003eSlightly\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax service temp.\u003c\/td\u003e\n\u003ctd\u003e+250°C (avoid \u0026gt;300°C)\u003c\/td\u003e\n\u003ctd\u003e+300°C\u003c\/td\u003e\n\u003ctd\u003e+300°C\u003c\/td\u003e\n\u003ctd\u003e+300°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCost\u003c\/td\u003e\n\u003ctd\u003ePremium\u003c\/td\u003e\n\u003ctd\u003eHigh\u003c\/td\u003e\n\u003ctd\u003eMedium-high\u003c\/td\u003e\n\u003ctd\u003eMedium\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBest for\u003c\/td\u003e\n\u003ctd\u003eOffshore, subsea, chemical, high-chloride structural\u003c\/td\u003e\n\u003ctd\u003eHigh-load marine \u0026amp; chemical\u003c\/td\u003e\n\u003ctd\u003eStandard marine \u0026amp; corrosive\u003c\/td\u003e\n\u003ctd\u003eGeneral outdoor \u0026amp; mild corrosive\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eChemical Composition — Duplex 2205 (UNS S32205)\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eElement\u003c\/th\u003e\n      \u003cth\u003eC\u003c\/th\u003e\n\u003cth\u003eCr\u003c\/th\u003e\n\u003cth\u003eNi\u003c\/th\u003e\n\u003cth\u003eMo\u003c\/th\u003e\n\u003cth\u003eN\u003c\/th\u003e\n\u003cth\u003eMn\u003c\/th\u003e\n\u003cth\u003eSi\u003c\/th\u003e\n\u003cth\u003eP\u003c\/th\u003e\n\u003cth\u003eS\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003cstrong\u003e% (max\/range)\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003e≤0.030\u003c\/td\u003e\n\u003ctd\u003e21.0–23.0\u003c\/td\u003e\n\u003ctd\u003e4.5–6.5\u003c\/td\u003e\n\u003ctd\u003e2.5–3.5\u003c\/td\u003e\n\u003ctd\u003e0.08–0.20\u003c\/td\u003e\n\u003ctd\u003e≤2.00\u003c\/td\u003e\n\u003ctd\u003e≤1.00\u003c\/td\u003e\n\u003ctd\u003e≤0.030\u003c\/td\u003e\n\u003ctd\u003e≤0.020\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003e* Per ASTM A276 \/ EN 10088-3 for UNS S32205 \/ 1.4462. The nitrogen (N) content is a key strengthening and pitting resistance element in Duplex 2205.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e🛢️ \u003cstrong\u003eOffshore oil \u0026amp; gas\u003c\/strong\u003e — subsea structural bolting, riser clamps, pipeline flanges, and topside structural connections where both high strength and chloride SCC resistance are mandatory\u003c\/li\u003e\n  \u003cli\u003e🚢 \u003cstrong\u003eMarine structures\u003c\/strong\u003e — structural bolting on vessels, offshore platforms, jetties, and marine equipment in continuous seawater exposure\u003c\/li\u003e\n  \u003cli\u003e🧪 \u003cstrong\u003eChemical processing\u003c\/strong\u003e — high-pressure flanges and structural connections in chloride-containing, acidic, or mixed-media chemical plant\u003c\/li\u003e\n  \u003cli\u003e🌊 \u003cstrong\u003eDesalination plants\u003c\/strong\u003e — structural and pressure-boundary bolting in seawater desalination equipment\u003c\/li\u003e\n  \u003cli\u003e🔧 \u003cstrong\u003ePressure vessels \u0026amp; heat exchangers\u003c\/strong\u003e — flange bolting in high-pressure, high-chloride service where austenitic grades are susceptible to SCC\u003c\/li\u003e\n  \u003cli\u003e🏭 \u003cstrong\u003ePulp \u0026amp; paper industry\u003c\/strong\u003e — structural and equipment bolting in bleaching and chemical recovery environments\u003c\/li\u003e\n  \u003cli\u003e🍼 \u003cstrong\u003eFood \u0026amp; beverage — aggressive CIP\u003c\/strong\u003e — structural bolting in high-chloride clean-in-place (CIP) environments where A4 may be insufficient\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What makes Duplex 2205 superior to A4 (SUS316) for structural bolts?\u003c\/strong\u003e\u003cbr\u003e\nA: Duplex 2205 offers three key advantages over A4 SUS316: (1) approximately 1.5–2× higher yield strength, allowing smaller or fewer bolts for the same load; (2) a PREN of ~38–40 vs ~24–26 for A4, providing dramatically better pitting and crevice corrosion resistance; and (3) far superior resistance to chloride stress corrosion cracking (SCC) — a failure mode that can affect austenitic grades (A2\/A4) at elevated temperatures in chloride environments.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is chloride stress corrosion cracking (SCC) and why does it matter?\u003c\/strong\u003e\u003cbr\u003e\nA: Chloride SCC is a failure mechanism where austenitic stainless steels (A2\/A4) can crack under tensile stress in the presence of chlorides and elevated temperatures (typically above 60°C). Duplex 2205 is highly resistant to chloride SCC due to its ferrite phase, making it the preferred material for offshore, chemical, and high-temperature marine applications where SCC is a design concern.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is Duplex 2205 magnetic?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes. The ferrite phase in Duplex 2205 makes it magnetic — unlike fully austenitic grades (A2\/A4) which are only slightly magnetic after cold working. This is a normal characteristic of duplex stainless steel and does not affect corrosion resistance or mechanical performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the temperature limitation of Duplex 2205?\u003c\/strong\u003e\u003cbr\u003e\nA: Duplex 2205 should not be used in continuous service above +250°C to +300°C. Prolonged exposure above 300°C can cause sigma phase embrittlement, reducing toughness. For high-temperature applications above 300°C, specify austenitic grades (A2\/A4) or high-temperature alloys instead.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can Duplex 2205 bolts gall during installation?\u003c\/strong\u003e\u003cbr\u003e\nA: Duplex 2205 has lower galling tendency than austenitic stainless steels due to its higher hardness and ferrite content. However, anti-seize compound (nickel-based recommended) should still be applied to threads before installation, especially for larger sizes (M20 and above) and stainless-to-stainless connections.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What nut and washer should I use with Duplex 2205 bolts?\u003c\/strong\u003e\u003cbr\u003e\nA: Use Duplex 2205 hexagon nuts and washers to maintain material compatibility and avoid galvanic corrosion. If Duplex nuts are unavailable, A4 stainless nuts (DIN 934) are acceptable for non-critical applications. Always use stainless washers (DIN 125) to protect the joint surface. For NACE MR0175 \/ ISO 15156 compliance, verify that all fastener components meet the applicable hardness and material requirements.\u003c\/p\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/partially-threaded-hexagon-bolts-din-931-duplex2205-stainless-steel.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}