JFE OCTG Products & Material Selection

SML-19-TK047 Rev.0Confidential
0
Notice: While every effort has been made to make this information, the use of the information is at the readers risk and no warranty is implied or expressed by JFE Steel Corporation with respect to the use of information contained herein. Copying is prohibited.
JFE OCTG Products & Material Selection
Copyright © 2019 JFE Steel Corporation. All Rights Reserved.
OCTG Seminar at Mandarin Oriental Hotel KL
28th November, 2019
2. JFE UHP Series
4. JFE’s Material Selection
2. JFE UHP Series
What is JFE Steel
JFE Steel was established by merger with NKK and Kawasaki Steel in 2003.
JFE HD (Holding company)
JFE Shoji Trade Corp.
JFE Engineering Corp.
Kawasaki Steel Steel business
Steel business
Other businesses
JFE Steel is a 8th major integrated steel mill in the world. World crude steel production ranking in 2018 (Consolidated) Source: WSA Rank Mill
1 ArcelorMittal 6 Shagang Group
2 China Baowu Group 7 Ansteel Group
3 Nippon Steel & Sumitomo Metal Corporation
8 JFE Steel Corporation
GAS/OIL Field
Hot rolled sheet for coil tube
13% Cr seamless for OCTG
LNG tanks
Stainless steels Stainless clad steel plates Sulfuric acid corrosion resistance steels
9% Cr steel pipes 9% Ni steelsHigh strength steel
plates and high strength steel pipes & tubes
JFE Steel is one of the world’s leading integrated steel producers. We develop unique “Only One” and market-leading “Number One” branded products, plus a wide range products for Energy Industry.
West Japan Works
Chita Works
JFE has various pipe mills located in 3 areas in Japan and secures enough capacity .
Type Capa (MT/Y) Pipe OD inch (mm) Mill Location
UOE Neo PressTM
Fukuyama
Press Bend 40,000 10 (254) – 125 (3,175) (OEM) OTK Tokushima
Sub total 540,000
100,000 7.5 (190.7) - 24 (610) Keihin
Sub total 400,000
Sub total 405,000
All Total 1,345,000
East Japan Works
West Japan Works
Row materials for Pipe and Tube products are supplied as round billet, hot coil and plate from East and West Japan Works.
24” ERW pipe square column
round pipe
We would like to contribute your business as Solution Provider.
Steel Solution
For Energy
Technical Service
FOXTM, JFEBEARTM, JFETIGERTM, JFELIONTM,
Various line up of CRA 13Cr, HP1, HP2, 11Cr
UHPTM-15CR,UHPTM-17CR
(C110-XS, 125S)
JFE-TC Global Technical Services all over the World
(Houston, Singapore, Dubai, Beijing)
8
Yield
Strength
(ksi)
API
Seamless
UHPTM- 15CR-125 (UHPTM-
JFE HP1-13Cr
JFE HP2-13Cr
JFE has been developing Martensitic Stainless Steel OCTG for high temperature sweet environment well condition since 1990’s .
1996 13Cr-5Ni-2Mo, equivalent to HP2-13Cr was registered in API5CRA
UNS No. for UHPTM17CR is issued.
(17CRS42825)
JFETIGERTM 7” 9-7/8”
1984
1999
2009
2011
JFE has been providing own PJ corresponding to the latest test protocol The latest connection test protocol is API 5C5 4th Edition – published in 2017
EXXON MOBIL (2001) Connection Evaluation Program
ISO13679: 2002 Petroleum and natural gas industries – Procedures for testing casing and tubing connections
ISO13679: DIS2009
JFE-TC Global established in 2012 as organization for OCTG service.
Technical Consulting including Material & Connection Recommendation
PJ License Control
Dubai
Singapore
Singapore
12
JFE Steel contributes to our customer’s success in the harsh environment through reliability of our technology and cost effectiveness. JFE Steel aims to be a solution provider and can provide cutting-edge technologies and services.
Steel Solution
For Energy
Technical Service
2. JFE UHP Series
UHPTM15CR
UHPTM17CR
JFE-13Cr
1990
1994
2004
2014
JFE HP1-13Cr
JFE HP2-13Cr
JFE has been developing Martensitic Stainless Steel OCTG for high temperature sweet environment well condition since 1990’s .
1996 13Cr-5Ni-2Mo, equivalent to HP2-13Cr was registered in API5CRA
UNS No. for UHPTM17CR is issued.
(17CRS42825)
Regular 13Cr 130C-150C/270F-300F
higher CO2 Corrosion resistance, higher SSC resistance
and higher strength than conventional 13Cr steel materials.
UHPTM
17CR -110
This diagram is to show general sense of limitation for each alloys.
Each limit changes by the parameters not listed here (pH, Cl- etc)
S S
(165C) (330F)
(130C) (270F)
(230C) (450F)
0.015 (2.2psi)
MPa
to Duplex stainless steels.
Yeild Strength Tensile Strength Elongation Hardness
Grade Min. Max. Min. Min. Max.
Unit psi (MPa) psi (MPa) psi (MPa) % HRC
13CR-80 80 (552) 95 (655) 95 (655) API Formula 23
13CR-85 85 (586) 100 (689) 100 (689) API Formula 24
13CR-95 95 (655) 110 (758) 105 (724) API Formula 27
HP1-13CR-95
PSL1: 28 PSL2: 27
HP1-13CR-110 110 (758) 130 (896) 120 (827) API Formula 32
HP2-13CR-110
UHP-17CR-110 <UNS No.S42825>
Martensite-based stainless steels show better performance on acidizing than duplex stainless steel.
(a) Simulated “live acid”(No Inhibitor) (b) Simulated “spent acid”(No Inhibitor)
C o
rr o
s io
n r
a te
Martensite-based stainless steels show better performance in acidizing than duplex stainless steel. Selective corrosion of ferrite occurs only in duplex stainless steels.
(22Cr)
selective corrosion
Strength at high Temperature of UHP
UHP Series can obtain High Strength without cold Drawing and keep high strength at high temperatures compared to Duplex.
100
95
94
Y S
Cold-drawn Duplex 25CR
) Unexpected O2 increase could occur by deaeration failure or unexpected temperature elevation could occur by interruption of operation.
42oC, 115ppb O2 (96Hr)
90oC, 50ppb O2
Temperature (oC)
Applicable Area
UHP-15CR and 17CR passed the corrosion test in such as these conditions.
Test Solution: Artificial seawater
Temperature T 40 40 T 100
Tubing Carbon
1%Cr
Carbon + GRE
Applicable Not ApplicableBoundary Area
GRE lined carbon steel is not applicable in the condition where there is concern about corrosion on the outside of tube. UHP is applicable even in the condition where 1%Cr steel or GRE lined carbon steel is not applicable
* The above table was made referring to NACE CORROSION 2008 Paper No.08089
Ultra Heavy Wall pipe of UHPTM15CR
JFE’s UHP Series has uniform microstructure and mechanical properties in ULTRA heavy wall thickness pipe. JFE has supplied UHPTM15CR-125 up to 10.75”OD x 2.535”WT.
Heat treatment (Water Quenching)
UHP-15CR-125 Coupling Stock OD10.75” WT2.535” for Coupling for Casing OD9” WT 1.35” for Ultra Deep Water
Supply Record of UHPTM-15CR-125 Field Proven: Accumulated global supply of 9,461MT
9,461MT
Area Country Location Connection OD WT (lbs/ft) Q'ty Year
North USA GOM JFEBEAR™ 4-1/2" 18.9 471 200410 America (Deep Shelf) JFEBEAR™ 5-1/2" 29.67 47
JFEBEAR™ 4-1/2" 18.9 146 Onland JFEBEAR™ 4-1/2" 18.9 52
JFEBEAR™ 2-7/8" 7.8 25 JFEBEAR™ 3-1/2" 12.7 28
GOM JFELION™-HW 7" 1.2" 1,008 201112 (Ultra Deep) JFELION™-HW 9" 1.35" 911 2012
PE 10" 0.732" 372 2013 PE 10-3/4" 1.250" 107 2013
GOM PE 10" 0.732" 343 2015 (Deep Water) PE 10" 0.732" 59 2016
PE 7.750" 0.595" 7 2017 Offshore PE 10.125" 0.795" 29 2018
South Brazil Offshore JFEBEAR™ 7" 12.65 105 2008 America JFEBEAR™ 3-1/2" 9.2 33 2009
Bolivia Onshore JFEBEAR™ 4-1/2" 21.5 193 2017 Asia Indonesia Onshore JFEBEAR™ 4-1/2" 18.9 256 2008
JFEBEAR™ 7" 38 78 2008 JFEBEAR™ 9-5/8" 53.5 36 2010 JFEBEAR™ 4-1/2" 18.9 107 2011
India Onshore JFEBEAR™ 4-1/2" 15.1 55 2013 Onshore JFEBEAR™ 4-1/2" 15.1 56 2018
Malaysia Offshore JFEBEAR™ 3-1/2" 9.2 13 2018 JFEBEAR™ 4-1/2" 12.6 145 2018 JFEBEAR™ 2-7/8" 6.2 75 2019 JFEBEAR™ 3-1/2" 9.2 23 2019 JFEBEAR™ 4-1/2" 12.6 145 2019
China China Onshore JFELION™ 3-1/2" 10.2 60 2018 Africa Angola Offshore PE 9-7/8" 62.84 280 2013
Oceania Australia Onland JFEBEAR™ 2-3/8" 4.6 96 2014 etc.
Asia Malaysia Offshore JFEBEAR™ 7" 29.0 830 2015 96 2016
Offshore JFEBEAR™ 7" 32.0 174 2016 Offshore JFELION™ 4-1/2" 12.6 282 2018 Offshore JFELION™ 4-1/2" 12.6 90 2019
North America
Area Country Connection Q'ty (MT) YearSizeLocation
Total 2,202 MT
Size Pipe 9.625” OD 0.545” wt. L36-42ft 295 ton
Coupling 10.750” OD x 1.260” wt. 30 ton Shipment ’14/May Cargo Ready
Arrive at Brazil 14/Oct after threading in Houston)
First Commercial Order Production completed and delivered to Brazil in 2014.
Supply Record of UHPTM-17CR-110
Client PETRONAS Carigali Sdn Bhd Site : Offshore gas field of NC3 site in Sarawak, Malaysia
Grade UHPTM-17CR-110 Thread JFEBEARTM
Size Pipe OD 7” 29# (OD 177.80mm X WT 10.36mm)
The first running in the world of 17CR in 2016/autumn
⇒ UHP can be Alternative to Duplex
UHP consists of much lower alloys than Duplex
⇒ Much Lower Cost than Duplex
UHP can be manufactured by hot rolling and heat treatment without cold drawing process
⇒ Higher strength at high temperature than Duplex ⇒ Much shorter delivery time than Duplex
Higher corrosion resistance in acidizing than Duplex
UHP can be used for sea water injection application instead of Duplex
JFE has many supply records of UHP including ultra heavy wall
UHP has been successfully used all over the world
2. JFE UHP Series
Collapse Pressure (-Resistance, -Strength)
• Min. expected external pressure at which the pipe would collapse if the pipe were subjected to no internal pressure or axial load.
• Collapse pressure is estimated by collapse testing. • API 5C3 specified collapse pressure for each API grade and size.
High Collapse Casing
Why required?
• Cost reduction (Thinner wall, Lower grade)
Port for pressure rising
JFE’s High Collapse Grades
JFE has developed high collapse grades, HC and HCX grades, for Q125, P110, C110 and T95.
HC means High Collapse and HCX means Extremely High Collapse, and their definitions are as the following table.
Grade YS range RBW Collapse test Guaranteed Collapse Value
Q125 125-150 ksi 87.5% N/A N/A (as per API formula)
Q125-HC 135-150 ksi 90.0% 1/heat/size Higher than API value
Q125-HCX 135-150 ksi 92.5% 1/heat/size Higher then HC value
P110 110-140 ksi 87.5% N/A N/A (as per API formula)
P110-HC 125-140 ksi 90.0% 1/heat/size Higher than API value
P110-HCX 125-140 ksi 92.5% 1/heat/size Higher then HC value
C110 110-120 ksi 87.5% N/A N/A (as per API formula)
C110-HC 110-120 ksi 90.0% 1/heat/size Higher than API value
C110-HCX 110-120 ksi 92.5% 1/heat/size Higher then HC value
T95 95-110 ksi 87.5% N/A N/A (as per API formula)
T95-HC 95-110 ksi 90.0% 1/heat/size Higher than API value
T95-HCX 95-110 ksi 92.5% 1/heat/size Higher then HC value
D/t
Heavier wall Thinner wall
PT = fymn[F/(D/t) - G]
Collapse with elastic property. Independent of YS.
Collapse with plastic property
Collapse between plastic and elastic property. Developed to connect PP
and PE curve smoothly.
A,B,C,F,G polynomial of fyms
SS curve of tensile test
Collapse mode is categorized into 4 types for convenience by API.
(Total: N = 583)
JFE has performed collapse testing for approx. 600 pieces of casing for development of high collapse casing.
# Grade Label OD (in) WT (in) D/t N
1 Q125 8-5/8" x 59.2# 8.625 0.700 12.32 20
2 Q125 10-3/4" x 85.3# 10.750 0.797 13.49 20
3 Q125 9-7/8" x 62.8# 9.875 0.625 15.80 15
4 Q125 14" x 115.0# 14.000 0.812 17.24 20
5 Q125 7-5/8" x 33.7# 7.625 0.430 17.73 20
6 Q125 11-7/8" x 71.8# 11.875 0.582 20.40 20
7 Q125 13-5/8" x 88.2# 13.625 0.625 21.80 21
8 Q125 16" x 109.0# 16.000 0.656 24.39 20
9 Q125 13-3/8" x 72.0# 13.375 0.514 26.02 20
10 P110 10-3/4" x 85.3# 10.750 0.797 13.49 20
11 P110 9-7/8" x 62.8# 9.875 0.625 15.80 20
12 P110 7-5/8" x 29.7# 7.625 0.375 20.33 10
13 P110 11-7/8" x 71.8# 11.875 0.582 20.40 20
14 P110 13-5/8" x 88.2# 13.625 0.625 21.80 20
15 P110 16" x 84.0# 16.000 0.495 32.32 20
# Grade Label OD (in) WT (in) D/t N
16 C110 10-3/4" x 85.3# 10.750 0.797 13.49 10
17 C110 9-7/8" x 62.8# 9.875 0.625 15.80 20
18 C110 7-5/8" x 33.7# 7.625 0.430 17.73 20
19 C110 11-7/8" x 71.8# 11.875 0.582 20.40 8
20 C110 13-5/8" x 88.2# 13.625 0.625 21.80 20
21 C110 16" x 109.0# 16.000 0.656 24.39 20
22 T95 7-5/8" x 55.3# 7.625 0.750 10.17 20
23 T95 10-3/4" x 85.3# 10.750 0.797 13.49 20
24 T95 9-5/8" x 58.4# 9.625 0.595 16.18 20
25 T95 14" x 115.0# 14.000 0.812 17.24 20
26 T95 9-5/8" x 53.5# 9.625 0.545 17.66 20
27 T95 10-3/4" x 65.7# 10.750 0.595 18.07 20
28 T95 7-5/8" x 29.7# 7.625 0.375 20.33 19
29 T95 13-5/8" x 88.2# 13.625 0.625 21.80 20
30 T95 13-3/8" x 77.0# 13.375 0.550 24.32 20
31 T95 8-5/8" x 28.0# 8.625 0.304 28.37 20
Note) Minimum YS are 135ksi for Q125 and 125ksi for P110
C o
ll a
p s
e p
re s
s u
API collapse value of Q125
API collapse value of P110/C110
API collapse value of T95
JFE collapse pressures are much higher than API. Collapse pressure depends on D/t and YS as well as API formula.
D/t21Collapse pressure does NOT depend on YS
⇒ Derivation of Elastic collapse equation
D/t21Higher grade shows higher collapse pressure
⇒ Derivation of Plastic collapse equation
Dependent on YS Independent of YS
Remaining Body Wall (RBW) Higher for Lower D/t
Ovality Lower
Eccentricity Lower
Mechanical Properties
Residual Stress (RS) Lower
Others Chemical Composition Controlled for Higher YR & ST
Comparison to API collapse values
Casing cost can be reduced by using HC grade instead of API grade because it enable reduction of linear mass or grade.
4,000
6,000
8,000
10,000
12,000
14,000
16,000
18,000
20,000
C o lla
( p s i)
Linear Mass (lb/ft)
2,000
4,000
6,000
8,000
10,000
12,000
14,000
16,000
C o lla
( p s i)
Linear Mass (lb/ft)
4,000
6,000
8,000
10,000
12,000
14,000
16,000
18,000
20,000
C o lla
( p s i)
Linear Mass (lb/ft)
C o lla
( p s i)
Linear Mass (lb/ft)
Connection
Material
Less hoop stress with JFE’s PJ (FOX, BEAR, TIGER, LION)
In order to reliable High Quality Sour Casing/Tubing, “Integrated Control from start to End of Manufacturing” must be required. JFE can manage whole manufacturing process from steel making to Inspection & SSC testing in house.
JFE’s Steel making& Casting Process
Strict QA/QC through steelmaking process gives you high cleanliness steel at our Steel mill in Japan.
Vacuum degassing
Grade
C90 80% 14.5
95
T95
T95-E Enhanced yield (≥100ksi)
Available at Region 3
T95-HC High Collapse Sour
Available at Region 3
C110
C110-HC High Collapse Sour
125 125S 85% 0.4(0.03bar) 3.5
C110,
[CPLG Stock] each length
max. 30HRC [PIN & Coupling]
P110-MS 110-140ksi min.125ksi
4-1/2”: 1/200jts/lot
4-1/2”: 1/100jts/lot
95S 95-110ksi min.110ksi max. 25HRC Same as tensile test
110S 110-125ksi min.120ksi max. 28HRC Same as tensile test
125S 125-140ksi min.130ksi [PIN] 1/100jts/lot
[CPLG] each length max. 36HRC Each length
Table. Differences of mechanical property between API Sour grades and JFE Sour Grades
0.3 kPa (0.05 psi)
0.0145
(psi)0.145 1.45 14.5 145
Region 0 - Non Sour Region 1 - Slight Sour Region 2 - Moderate Sour Region 3 - Severe Sour
0.001 (bar)0.01 0.1 1 10
JFE-125S (0.03bar, pH3.5)
T95: 80%SMYS or 90%SMYS (PSL3) C110(-XS) 85%SMYS
85%SMYS
85%SMYS
Available SSC Testing
Method A (Smooth Tensile) Method B (Bent Beam) Method C (C-Ring) Method D (DCB)
Modern test equipments with vast capacity in JFE Chita
Works provide high quality test result with shorter lead time.
DCB Test Results of Heavy Wall C110
JFE has supplied heavy-wall C110 with DCB test requirement. DCB tests were successfully completed, using test specimen without pre-crack.
DCB Test Results
Test pipe API C110 (mill-product) OD=6.05~15.00 in., WT=0.7620~1.875 in.
Single K1ssc
Hardness (HRC)
K 1
s s
Hardness (HRC)
K 1
s s
Available Size for API 5CT T95
inch/mm 0.5inch, 12.7mm 1.0", 25.4mm 1.5", 38.1mm 2.0", 50.8mm mm 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 110
4-1/2" 115 114.3mm 120
185 190
13-3/8" 335 339.72mm 340 13-5/8" 345 346.07mm 350
355 360 365 370 375
15" 380 381.0mm 385
Supply Record
JFE has supplied various sizes of T95 and can supply below range
Available Size for API 5CT C110
inch/mm 0.5inch, 12.7mm 1.0", 25.4mm 1.5", 38.1mm 2.0", 50.8mm mm 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 110
4-1/2" 115 114.3mm 120
185 190
13-3/8" 335 339.72mm 340 13-5/8" 345 346.07mm 350
355 360 365 370 375
15" 380 381.0mm 385
16" 405 406.4mm 410
JFE has supplied various sizes of C110 and can supply below range 1” 2”
WT
OD
0
20
40
60
80
100
40 80 120 160 200 240 280 320
H 2 S
p a rt
ia l p
40 80 120 160 200 240 280 320
H 2 S
p a rt
ia l p
40 80 120 160 200 240 280 320
H 2 S
p a rt
ia l p
No crack Crack
Method:4 point bent beam test Solution: 5%NaCl (CO2 bal.) pH: 3.1 Stress: 90%AYS Duration: 720h N of test: 2 specimens / condition
*The ratio of solution volume to the total surface area of specimens =30ml/cm2
-XS
Development of JFE-125S
C Mn P S Cr Mo Ni V Nb Ti Cu
API C110 Max.
Chemical composition
< API C110 >
25µm 25µm
< JFE-125S >
Prior austenite grain size of JFE-125S is the same or smaller than API C110
Mean grain size: 5.4mm Mean grain size: 5.0mm
24
26
28
30
32
34
36
38
40
Yield Stress (0.65% EUL) [ksi]
M ax
JFE has developed JFE-125S as a high strength Sour Grade
Mechanical test data
JFE 125 Sour Grade
SSC Method A test of JFE-125S passed up to 10% H2S
JFE-125S OD=177.8mm, WT=24.13mm YS=137ksi, TS=147ksi, HRC=33.6
Test condition - Location : Exova (Houston) - Method A - Solution B (pH=3.5) - Gas: 3%, 4%, 10%H2S - Applied stress: 85% SMYS - using N2 Cabinet
- Temperature: RT (24) - Duration: 30 days
Test results - Passed (No crack)
2.5
3.5
4.5
5.5
6.5
In s
Region 0
Region 1
Region 2
Region 3
Passed
inch/mm 0.5inch, 12.7mm 1.0", 25.4mm 1.5", 38.1mm 2.0", 50.8mm 2.5", 63.5mm
mm 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64
110 4-1/2" 115 114.3mm 120
125 130 135
185 190
13-3/8" 335 339.72mm 340 13-5/8" 345 346.07mm 350
355 360 365 370 375
15" 380 381.0mm 385
50
Available Size for JFE-125S JFE has evaluated various sizes of 125S and can supply below range with SSC testing at 75F, Method A, 3%H2S, Solution B (pH 3.5).
1” 2” WT
0.3 kPa (0.05 psi)
1 0.001 0.01 0.1 (MPa)
(psi)0.145 1.45 14.5 145
Region 0 - Non Sour Region 1 - Slight Sour Region 2 - Moderate Sour Region 3 - Severe Sour
0.001 (bar)0.01 0.1 1 10
Grade SSC Testing
Table. SSC Test Condition of P110-MS before Shipment
JFE’s P110-MS is applicable up to Region 2 instead of C110 with cheaper price.
qualified
qualified
2. JFE UHP Series
CO2 Corrosion (General Corrosion)
Sulfide Stress Cracking (SSC)
Corrosion Type CO2 Corrosion (General Corrosion)
Sulfide Stress Cracking (SSC)
Mechanism Anodic Reaction (Dissolution of Iron)
Hydrogen Embrittlement
Cracking
Time to Failure Months ~ Years Days ~ Weeks ~ Months
⇒ Electrons in steel keep being consumed by H+
⇒ Iron keeps dissolving in water emitting electrons
Hab
Hab
Hab
Hab
Fe
Dissolution of iron or non-metal Inclusion forms tiny pit. A pit can be an origin of cracking.
Tensile Stress
Tensile Stress
H2S inhibits production of H2 gas and thus promotes H atom penetration into steel.
H atoms adsorbed on steel surface are absorbed into steel. Had → Hab
Combination of Hydrogen embrritlement and tensile stress cause crack at the bottom of a pit. Cracking proceeds by concentration of stress and hydrogen atoms on the crack tip.
Anode Fe → Fe2+ + 2e-
Condensed
Tubing ID
Strong
Correlation
Severer Milder
Formation
= K’ + log [HCO3] [H2CO3]
Example)
(0.1%)
0.85mm/y
0.58mm/y
150C
13Cr stainless steel
Duplex stainless steel
“FW at BH” condition
Milder
Corrosion rate of carbon/low alloy steel is estimated too high (> 0.5mm/y).
0.1
1
10
Open: ≤ 0.127mm/y Closed: > 0.127mm/y
100 0.08
0.01 Numbers in the map show corrosion rate (CR) in mm/year
50MPa150
0.02
0.07
Severer than well condition
0.165%NaCl (1,000ppm Cl)
90%AYS, 24C, 720Hr
Well condition is in unacceptable area of SSC domain map of HP2-110. Therefore, HP2-110 is not suitable for the well.
0.165%NaCl (1,000ppm Cl)
100%SMYS (125ksi), 24C, 720Hr
Well condition is out of acceptable area and very close to unacceptable area of SSC domain map of 15CR-125. Therefore, 15CR-125 is not considered suitable for the well (Fit-for-purpose test is needed for more accurate evaluation).
No Failure
0.165%NaCl (1,000ppm Cl)
90%AYS, 24C, 720Hr
Well condition is in acceptable area of SSC domain map of 17CR-110. Therefore, 17CR-110 is considered suitable for the well.
No Failure
JFE-UHP-17CR-110 is considered suitable for the well. JFE-UHP-15CR-125 and lower grades are not considered suitable. However, as for UHP-15CR-125, fit-for-purpose test is a better way to evaluate its suitability more accurately .

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JFE OCTG Products & Material Selection