Sulfide stress cracking resistant
metallic materials for oilfield equipment
1. Scope
1.1.
This
standard presents metallic material requirements for sulfide stress cracking
(SSC) for petroleum production, drilling, gathering and flowing equipments, and
field processing facilities to be used in hydrogen sulfide (H2S)
bearing hydrocarbon service.
1.2.
This
standard applies to all components of equipment exposed to sour environments.
Where failure by SSC would.
1.2.1.Prevent
the equipment from being restored to an operating condition
while
continuing to contain pressure.
1.2.2.Compromise
the integrity of the pressure containment system, and/or
1.2.3.prevent
the basic function of the equipment from occurring.
1.3.
SSC
is affected by factor such as
1.3.1.Material
chemical composition, strength, heat treatment and microstructure.
1.3.2.Hydrogen
ion concentration (PH) of the environment.
1.3.3.H2S
concentration and total pressure.
1.3.4.Total
tensile stress (applied plus residual ).
1.3.5.Temperature
and
1.3.6.Time
The user has to determine whether or not
the environmental conditions are such that MR0175 applies.
2. SSC may be controlled by.
2.1.Using the
materials and process prescribed in NACE standard
2.2.Controlling
the environment or
2.3.Isolating
the components from sour environment
3.
Test
levels I to VII depending on environmental condition.
4. Ferrous metals
The Susceptibility to SSC of most ferrous
metals can be strongly effected by heat treatment cold
work or both.
Carbon
& low alloy steels
All carbon & low alloy steels are
acceptable at 22 HRC maximum hardness provided they (a) contain less than 1%
nickel (2) will meet the fabrication process & in process heat treatment as
specified in the standard (3) are used in one of the following heat treated
conditions.
a) Hot rolled (carbon steels only)
b) Annealed
c) Normalized
d) Normalized & tempered
e) Normalized austenitized
; quenched & tempered
f)
Anstenitized
quenched & tempered.
Fabrication process
a) The metal must be thermally stress
relieved following any cold deforming by rolling, cold forging or any other
manufacturing process that results in a permanent outer fiber deformation
greater than 5% min S.R. temperature 595oC
This requirement does not apply
to pipe grades as listed herein or cold work imparted by
pressure
test up accordingly to applicable code.
Acceptable API and ASTM specifications
for Tubular goods
|
For all Temperature A |
Operating
Temperatures B |
||
|
For
65OC (150 OF) or Grater |
For 80OC
(175 OF) or Grater |
For
≥107OC (≥225OF) |
|
|
Tubing
and casing API
Spec 5CT Grs.H-40C , J-55 , K-55 , C-75 (types 1,2,3) and L-80
(type 1) |
Tubing and
Casing Api spec 5CT Gr
N-80 (Q & T)
& Gr. C-95 |
Tubing and
Casing API Spec 5CT Grs. H-40, N-80 P-105 & P-110 |
API
Spec 5CT Gr. |
|
Pipe
D,E API
spec 5L Grs A & B and Grs
X-42 through X-65 ASTM
A53 A106
Gr. A,B,C A333
Gr 1 & 6 A524
Gr 1 & 2 A381
Cl 1 Y35-Y65 |
Proprietary Q
& T Grs with 110 Ksi or |
Proprietary Q
& T Grs to 140 ksi
maximum Y.S |
|
|
Note
Pipe shall have a maximum hardness of 22 HRC |
|||
b) Welding procedure to be followed as per
AWS/API/ASME
c)
Hardness
to be controlled on weld & HAZ.
d) Welding rods, electrodes, fluxes, filler
metals with more than 12 nickel shall not be used.
e)
Identification
stamping using low stress (dot, vibratory and round V )
stamps is acceptable. Sharp V stamping is not permitted in low stress areas
unless subsequently stress relieved at minimum 595oC.
f)
Cold
deformation by controlled shot peening is permitted
when applied to base metals to base metals and when limited to the use of
maximum shot size of 2mm.
and a maximum of
10C. Almen
intensity. The process shall be controlled as per MIL-S- 13165