MATERIAL DESCRIPTION

Alloy 925 is a precipitation hardened nickel-iron-chromium alloy with additions of molybdenum, copper and aluminum. The alloy combines high strength and excellent corrosion resistance. The alloy has outstanding resistance to general corrosion, pitting, crevice corrosion and stress corrosion. Alloy 925 is used in various applications requiring a combination of high strength and corrosion resistance. Because of the alloy’s resistance to sulfide stress cracking and stress-corrosion cracking in “sour” (H2S containing) crude oil and natural gas, it is used for down-hole and surface gas- well components including tubular products, valves, hangers, landing nipples, tool joints and packers.

CHEMICAL COMPOSITION

WEIGHT% C SI MN S P CR NI MO NB CU TI AL FE
MIN.  19,50  42,00  2,50  1,50  1,90  0,10  22,00
MAX.  0,030  0,50  1,00  0,03  0,03  22,50  46,00  3,50  0,50  3,00  2,40  0,50

Approvals: NACE MR0175

APPLICATIONS

Used in oil production equipment, surface and down hole equipment in sour gas wells.

Mechanical Properties

YIELD STRENGTH
RP0.2
MPA
TENSILE STRENGTH
RM
MPA
ELONGATION
[%]
HARDNESS
[HRC]
IMPACT
CHARPY-V, -60ºC
[J]
 ≥ 758  ≥ 965  ≥ 25  ≤ 38  ≥ 47

Heat Treatment

Solution annealed at 980 – 1040°C. Age hardening at 730 – 750°C.

Weldability

Very good.

ALLOY 925 / UNS N09925 ROUND BAR

DESCRIPTION KG/M
92 mm 55.
122 mm 96.8
168 mm 184
180 mm 211
202 mm 266
222 mm 321
290 mm 547