Stainless Steel L80-13Cr
L80-13Cr is an API 5CT oilfield tubular grade based on modified 13% chromium martensitic stainless steel, supplied quenched and tempered to 600 MPa yield, 700 MPa tensile, 20% elongation and a controlled hardness near 230 HB (21 HRC).
Reference datasheet — L80-13Cr is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the QT condition
L80-13Cr tempers and conditions
L80-13Cr is supplied in 3 conditions, soft to hard. QT is the default FabDigit quotes; the values on this page are for it.
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 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?
L80-13Cr is an API 5CT oilfield tubular grade based on modified 13% chromium martensitic stainless steel, supplied quenched and tempered to 600 MPa yield, 700 MPa tensile, 20% elongation and a controlled hardness near 230 HB (21 HRC). It is selected for production tubing, casing and couplings in CO2-bearing and mildly sour wells where carbon-steel tubulars corrode too quickly. The hardness cap limits sulfide-stress-cracking risk but service is rated to about 150 °C, and chloride pitting or heavier H2S loading calls for super 13Cr or duplex grades instead. L80-13Cr 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). L80-13Cr has a yield strength of 600 MPa (87 ksi) and a tensile strength of 700 MPa (102 ksi) — stronger than 86% of stainless steel grades. Elongation at break is 20% and the elastic modulus is 200 GPa (29 Msi).
What is L80-13Cr used for?
- oil country tubular goods
- downhole production tubing
- casing
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
- Conducts heat well — 24.9 W/m·K (14.4 BTU/hr·ft·°F), better than 87% of stainless steel grades
- High strength — 600 MPa (87 ksi), better than 86% of stainless steel grades
Limitations
- Limited service temperature — 150°C (302 °F), worse than 100% of stainless steel grades
- Difficult to weld — 30/100, worse than 88% of stainless steel grades
- Needs corrosion protection — 45/100, worse than 85% of stainless steel grades
- Limited ductility — 20%, worse than 79% of stainless steel grades
- Low fracture toughness — 90 MPa·√m (81.9 ksi·√in), worse than 75% of stainless steel grades
L80-13Cr properties
Typical room-temperature values for L80-13Cr-QT; bars are the position among stainless steel grades.
Physical3
L80-13Cr 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 has a yield strength of 600 MPa (87 ksi) and a tensile strength of 700 MPa (102 ksi) — stronger than 86% of stainless steel grades. Elongation at break is 20% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
L80-13Cr 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 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 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's machinability is fair (40/100, better than 72% of stainless steel grades); weldability poor (30/100); formability poor (30/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. L80-13Cr is highlighted; hover a dot for its name, or open the interactive family chart.
Working with L80-13Cr
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.
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 |
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.
Surface treatments FabDigit runs on stainless steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Passivation
Organic Coating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel L80-13Cr in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Also called
- L80-13Croil pipe steel13Croil pipe
How much does L80-13Cr cost?
L80-13Cr is a premium-cost stainless steel ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
L80-13Cr — frequently asked
What is L80-13Cr used for?
L80-13Cr 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?
L80-13Cr has a typical yield strength of 600 MPa (87 ksi) and a tensile strength of 700 MPa (102 ksi) — stronger than 86% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is L80-13Cr 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 be welded?
Not readily — weldability is rated poor (30/100). 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?
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 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?
L80-13Cr 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.
How much does L80-13Cr cost?
L80-13Cr is a premium-cost stainless steel ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.