Stainless Steel L80-13Cr QT-CPLG
Other
QT-CPLG = qT coupling stock
Pick for 13Cr couplings, pup joints and cross-overs machined from Q&T bar or heavy-wall tube to the same L80 mechanical envelope.
Values for the QT-CPLG condition
Other L80-13Cr tempers and conditions
L80-13Cr is listed in 3 conditions; see the grade overview at L80-13Cr.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Intermediate/soft condition used before final Q&T when heavy machining, threading or forming is required; not an API 5CT delivery condition. | 320 | 520 | 28 | 180 HB | — |
QTDefault Quenched and tempered | Standard supply condition for seamless 13Cr tubing/casing: 552–655 MPa yield, hardness capped at 23 HRC for sour-service compliance. | 600 | 700 | 20 | 21 HRC | — |
QT-CPLGThis page QT coupling stock | Pick for 13Cr couplings, pup joints and cross-overs machined from Q&T bar or heavy-wall tube to the same L80 mechanical envelope. | 610 | 720 | 18 | 22 HRC | 3 % IACS |
What is L80-13Cr QT-CPLG?
L80-13Cr QT-CPLG is L80-13Cr in the QT-CPLG condition — pick for 13Cr couplings, pup joints and cross-overs machined from Q&T bar or heavy-wall tube to the same L80 mechanical envelope. L80-13Cr QT-CPLG has a yield strength of 610 MPa (88.5 ksi) and a tensile strength of 720 MPa (104 ksi) — stronger than 87% of stainless steel grades. Elongation at break is 18% and the elastic modulus is 200 GPa (29 Msi). L80-13Cr QT-CPLG has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,450°C (2,642 °F). QT is the default condition FabDigit quotes; QT-CPLG is available on request or by drawing note.
Advantages
- High electrical conductivity — 3 % IACS, better than 95% of stainless steel grades
- Low embodied carbon — 3.4 kg CO₂/kg, better than 91% of stainless steel grades
- High strength — 610 MPa (88.5 ksi), better than 87% of stainless steel grades
- Conducts heat well — 24.9 W/m·K (14.4 BTU/hr·ft·°F), better than 87% of stainless steel grades
Limitations
- Limited service temperature — 150°C (302 °F), worse than 100% of stainless steel grades
- Difficult to weld — 28/100, worse than 90% of stainless steel grades
- Needs corrosion protection — 45/100, worse than 85% of stainless steel grades
- Limited ductility — 18%, worse than 83% of stainless steel grades
- Limited formability — 25/100, worse than 78% of stainless steel grades
L80-13Cr QT-CPLG properties
Typical room-temperature values for L80-13Cr QT-CPLG; 22 are specific to this condition. Other listed values are L80-13Cr reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
L80-13Cr QT-CPLG has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,450°C (2,642 °F).
Mechanical16
L80-13Cr QT-CPLG has a yield strength of 610 MPa (88.5 ksi) and a tensile strength of 720 MPa (104 ksi) — stronger than 87% of stainless steel grades. Elongation at break is 18% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
L80-13Cr QT-CPLG is rated for continuous service to 150°C (302 °F). It conducts heat at 24.9 W/m·K (14.4 BTU/hr·ft·°F), better than 87% of stainless steel grades. Thermal expansion is 10.5 µm/m·K (5.83 µin/in·°F).
Electrical3
L80-13Cr QT-CPLG conducts electricity at 3 % IACS, better than 95% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 85% of stainless steel grades.
Sustainability4
Producing a kilogram of L80-13Cr QT-CPLG takes about 45 MJ of energy and emits 3.4 kg of CO₂ — less than 91% of stainless steel grades. Typical recycled content is 40%.
Manufacturability7
L80-13Cr QT-CPLG's machinability is fair (40/100, better than 72% of stainless steel grades); weldability poor (28/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with L80-13Cr QT-CPLG
Is L80-13Cr easy to machine?
Machines like Q&T 410: rigid setups, sharp positive-rake carbide, moderate speed with heavy flood coolant; work-hardens and produces stringy chips, so avoid dwelling and use annealed stock for heavy threading.
Can L80-13Cr be welded?
Air-hardening HAZ — preheat 200–300 °C, use matching 13Cr or over-alloyed/super-duplex/Ni-base filler, and post-weld temper below the original tempering temperature; field girth welding is normally avoided in favour of threaded connections.
Can L80-13Cr be formed, bent or molded?
Hot form 1000–1150 °C followed by full re-quench and temper; cold forming is limited in the Q&T state and best done annealed with generous bend radii.
What surface finishes work on L80-13Cr?
Passivation or pickle-and-passivate restores the chromium oxide film after machining; phosphating/Cu-plating of threads plus API-approved dope prevents galling — do not use carbon-steel-contaminated tooling or brushes.
L80-13Cr chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| CAPI 5CT L80 Type 13Cr | 0.15 – 0.22 | 0.19 |
| Mn | 0.25 – 1 | 0.6 |
| Si | ≤ 1 | 0.4 |
| P | ≤ 0.02 | 0.01 |
| S | ≤ 0.01 | 0 |
| Cr | 12 – 14 | 13 |
| Ni | ≤ 0.5 | 0.2 |
| Cu | ≤ 0.25 | 0.1 |
| Moresidual, some mills restrict | ≤ 0.25 | 0.05 |
| Fe | balance | — |
L80-13Cr QT-CPLG — frequently asked
What is L80-13Cr QT-CPLG used for?
L80-13Cr QT-CPLG is typically used for oil country tubular goods, downhole production tubing and casing. In short: API 5CT CO2-service tubing; hardness-capped for sour limits; threaded rather than welded.
What is the yield strength of L80-13Cr QT-CPLG?
L80-13Cr QT-CPLG has a typical yield strength of 610 MPa (88.5 ksi) and a tensile strength of 720 MPa (104 ksi) — stronger than 87% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is L80-13Cr QT-CPLG easy to machine?
Not especially — machinability is rated fair (40/100, better than 72% of stainless steel grades). Machines like Q&T 410: rigid setups, sharp positive-rake carbide, moderate speed with heavy flood coolant; work-hardens and produces stringy chips, so avoid dwelling and use annealed stock for heavy threading.
Can L80-13Cr QT-CPLG be welded?
Not readily — weldability is rated poor (28/100). Air-hardening HAZ — preheat 200–300 °C, use matching 13Cr or over-alloyed/super-duplex/Ni-base filler, and post-weld temper below the original tempering temperature; field girth welding is normally avoided in favour of threaded connections.
What surface finishes work on L80-13Cr QT-CPLG?
Passivation or pickle-and-passivate restores the chromium oxide film after machining; phosphating/Cu-plating of threads plus API-approved dope prevents galling — do not use carbon-steel-contaminated tooling or brushes.
Can L80-13Cr QT-CPLG be formed, bent or molded?
Hot form 1000–1150 °C followed by full re-quench and temper; cold forming is limited in the Q&T state and best done annealed with generous bend radii.
What is the maximum service temperature of L80-13Cr QT-CPLG?
L80-13Cr QT-CPLG is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between L80-13Cr-QT and L80-13Cr-ANN?
QT is the default condition — standard supply condition for seamless 13Cr tubing/casing: 552–655 MPa yield, hardness capped at 23 HRC for sour-service compliance. ANN: intermediate/soft condition used before final Q&T when heavy machining, threading or forming is required; not an API 5CT delivery condition. Yield strength is 600 MPa in QT versus 320 MPa in ANN.
Sources
- API 5CT / ISO 11960 — Casing and Tubing (L80 Type 13Cr) — American Petroleum Institute (2018)
- NACE MR0175 / ISO 15156-3 — Cracking-resistant CRAs for H2S service — NACE/ISO (2020)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys (Type 410 family) — ASM International (1990)
- 13Cr OCTG product data (tubing/casing grades) — Vallourec / Tenaris / JFE Steel (2022)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.