STAINLESS STEEL - aksteel.com

1 PRODUCT DATA BULLETINO xidation resistance and corrosion resistance superior to Type 409 make AK STEEL 439 attractive for numerous automotive exhaust applications. Suggested applications include tubular manifolds and other exhaust system areas where temperatures may exceed the oxidation limit of Type 409 or where aqueous corrosion resistance, particularly to chlorides, is needed. Type 439 performs well in oxidizing environments and resists stress corrosion cracking. The alloy s good weldability, high thermal conductivity and low thermal expansion make it a good choice for many applications.

2 Non-automotive applications include heat exchanger tubing, kitchen equipment, household appliances and architectural structures. AK STEEL 439 ULTRA FORM STAINLESS STEEL was developed for applications with more severe forming requirements than standard Type 439 STAINLESS STEEL . The material offers advantages for parts requiring complex Oxidation Resistant Than Type 409 Good Weldability and Resistance to Intergranular CorrosionMore Corrosion Resistant Than Type 409 Non-hardening Formable439 HIGH PERFORMANCE-10 439 ULTRA FORM STAINLESS STEELUNS S43035439 HIGH PERFORMANCE-10 / 439 ULTRA FORM STAINLESS STEEL439 HIGH PERFORMANCE-10 /439 ULTRA FORM STAINLESS STEELTABLE OF CONTENTSP roduct Description.

3 1 Composition ..1 Available Forms ..1 Mechanical Properties ..2 Physical Properties ..5 Oxidation Resistance ..6 Corrosion Resistance ..8 Formability ..11 Weldability ..11439 HIGH PERFORMANCE-10 /439 ULTRA FORM STAINLESS STEEL1439 HIGH PERFORMANCE-10 /439 ULTRA FORM STAINLESS STEELAK STEEL 439 is a ferritic STAINLESS STEEL that outperforms Type 409 in both oxidation resistance and corrosion resistance. Type 439 is stabilized with a titanium addition resulting in good weldability. The alloy resists intergranular corrosion and stress corrosion cracking. It has higher thermal conductivity and lower coefficient of expansion than STEEL 439 ULTRA FORM STAINLESS STEEL provides an outstanding combination of improved forming characteristics over standard Type benefits are achieved through precise control of chemistry and thermo-mechanical processing from melting to finishing.

4 This provides special advantages when producing difficult-to-form exhaust system componentsCOMPOSITION(wt %)Carbon(C) (Mn) (P) (S) (Si) (Cr) (Ni) (N) (Ti) + 4(C+N) min. (Al) FORMS AK STEEL 439 HP10 is available in thicknesses from in. ( mm) in widths up to and including 48 in. (1219 mm). For other sizes, please contact your AK STEEL sales STEEL 439 ULTRA FORM STAINLESS STEEL is available in thicknesses from in. ( mm) in widths up to 48 in. (1219 mm). For other sizes, please contact your AK STEEL sales values shown in this bulletin were established in customary units.

5 The metric equivalents of customary units shown may be approximate. PRODUCT DESCRIPTION2439 HIGH PERFORMANCE-10 /439 ULTRA FORM STAINLESS STEELTABLE 1 MECHANICAL PROPERTIES439 ULTRA FORM STAINLESS STEEL ANNEALED CONDITION TRANSVERSE ORIENTATION 439 439 ULTRA FORMASTM A240 UTS, ksi. (MPa)66 (455)66 (455)60 (414) YS, ksi. (MPa)41 (283)41 (283) 30 (207) , % in 2" ( mm)303322 HardnessB75B74B89 2 EFFECT OF COLD WORK ON MECHANICAL PROPERTIES 439 ULTRA FORM STAINLESS STEEL ConditionUTSksi. (MPa) YSksi. (MPa)Elongation % in 2" ( mm)RockwellHardness B (438) (263)3573 Cold Worked 5% (484) (460)2485 Cold Worked 10% (546) (544)1289 Cold Worked 15% (618) (613) 792 Cold Worked 30% (713) (680) 496 Cold Worked 50% (785) (753) 397 TABLE 3 EFFECT OF 900 F (482 C) PROPERTIES EXPOSURE ON ROOM TEMPERATURE MECHANICAL PROPERTIESC onditionUTSksi.

6 (MPa) YSksi. (MPa)Elongation % in 2" ( mm)RockwellHardness (483) (303) 35B77 Annealed + 10 hrs. @900 F (482 C) (501) (337) + 100 hrs. @900 F (482 C) (621) (511) + 100 hrs. @900 F (482 C)+ 1 hr. @ 1100 F (593 C) (491) (316) 32B79 Annealed + 1000 hrs. @900 F (482 C) (768) (677) Worked 30% (730) (715) 4B97 Cold Worked 30% + 100 hrs. @900 F (482 C) (849) (794) Worked 30% + 100 hrs. @900 F (492 C) + 1 hr. @900 F (492 C) (725) (665) 12B99*All values are average of duplicate tests except * denotes a single PROPERTIES3439 HIGH PERFORMANCE-10 /439 ULTRA FORM STAINLESS STEELTABLE 4 SHORT-TIME ELEVATED TEMPERATURE STRENGTHT emperature F ( C)UTSksi.

7 (MPa) YSksi. (MPa)1000(538) (257) (146)1200(650) (122) (83)1300(705) (65) (48)1400(761) (40) (32)1500(817) (29) (23)1584(862) (20) (18)TABLE 5 FATIGUE PROPERTIES Temperature F ( C)Fatigue Strength (r = ) to Surpass 107 Cycles ksi. (MPa)4391300(704) (38)1500(816) (14)TABLE 6 STRESS RUPTURE PROPERTIES Temperature, 1300 F (704 C)Temperature, 1500 F (815 C)Stress, ksi. (MPa)100 , ksi. (MPa)1,000 , ksi. (MPa)100 , ksi. (MPa)1,000 ( ) ( ) ( ) ( )4439 HIGH PERFORMANCE-10 /439 ULTRA FORM STAINLESS STEEL4336302316103-3-250-200-150-100-500 50100(-157)(-129)(-101)(-73)(-46)(-18)(1 0)(38)Temperature, F ( C)W/A in.

8 , (J)IMPACT PROPERTIESD uctile to brittle transition curves were obtained from the charpy V-notch test. Longitudinal and transverse transition curves are shown in Figures 1 and 2. Material tested was in. ( mm) thick. The transition temperature is the point on the graph where the material changes sharply from displaying ductile behavior to displaying brittle behavior. The transition temperature shown by the graph for the longitudinal samples tested is -130 F (-90 C) and for the transverse samples, -160 F (-107 C).FIGURE 1 LONGITUDINAL IMPACT 439 ULTRA FORM STAINLESS STEELFIGURE 2 TRANSVERSE IMPACT 439 ULTRA FORM STAINLESS STEEL333026232017131073-250-200-150-100- 50050100(-157)(-129)(-101)(-73)(-46)(-18 )(10)(38)W/A in.

9 , (J)Temperature, F ( C)5439 HIGH PERFORMANCE-10 /439 ULTRA FORM STAINLESS STEELTABLE 7 PHYSICAL PROPERTIESD ensity, (kg/m3) (7685)Electrical Resistivity ( in.) 8 YOUNG'S MODULUS VS TEMPERATUREY oung s Modulus versus temperature, psi. (MPa)Temperature F ( C)Young's Modulus70 (21) x 106 (193 x 103)300(148) x 106 (190 x 103)500(260) x 106 (183 x 103)700(427) x 106 (181 x 103)900(482) x 106 (169 x 103)1100(593) x 106 (154 x 103)1300(704) x 106 (139 x 103)TABLE 9 AVERAGE COEFFICIENT OF THERMAL EXPANSIONT emperature F ( C)10-6 F200 (93) ( )400(204) ( )600(316) ( )800(427) ( )1100(593) ( )1300(704) ( )1500(816) ( )1600(871) ( )

10 PHYSICAL PROPERTIES6439 HIGH PERFORMANCE-10 /439 ULTRA FORM STAINLESS STEELR esults of cyclic oxidation tests of ALUMINIZED STEEL Type 1 and Type 409, AK STEEL 439 and Type 304 STAINLESS Steels are shown in Tables 8 and 9. AK STEEL 439 exhibits considerably better oxidation resistance than Type 409 at the 1700 F (927 C) 2 CYCLIC OXIDATION AT 900 C (1650 F) 1 CYCLE = 25 min. HEAT/5 mins. COOLOXIDATION RESISTANCEF igures 3, 4 and 5 provide results from 1500 F (816 C), 1600 F (871 C) and 1700 F (926 C) cyclic oxidation tests. The 439 ULTRA FORM STAINLESS STEEL samples were tested until they gained sufficient weight to reach the point of breakaway oxidation and catastrophic failure.