# API 5L Line Pipe Grade Yield and Tensile Strength Reference > Source: https://netray.co/tools/api-5l-line-pipe-grade-strength-reference > Publisher: Netray (netray.co), AI and integration engineering for ERP and manufacturing systems. > Section: Free Tools ## Short answer Specified minimum yield and tensile strength for API 5L grades A25 to X80, with ISO 3183 L grade equivalents. ## Category industry-templates ## Industry Oil and Gas Equipment ## Audience - Buyer - Quality engineer - Pipeline engineer - Materials planner ## Tool **Kind:** worksheet **Mode:** reference **Columns:** #### API 5L grade **Key:** grade **Type:** text #### ISO 3183 grade **Key:** iso **Type:** text #### Min yield (psi) **Key:** ysi **Type:** text #### Min yield (MPa) **Key:** ysm **Type:** text #### Min tensile (psi) **Key:** tsi **Type:** text #### Min tensile (MPa) **Key:** tsm **Type:** text **Rows:** **Grade:** A25 **Iso:** L175 **Ysi:** 25,400 **Ysm:** 175 **Tsi:** 45,300 **Tsm:** 310 **Grade:** A **Iso:** L210 **Ysi:** 30,500 **Ysm:** 210 **Tsi:** 48,600 **Tsm:** 335 **Grade:** B **Iso:** L245 **Ysi:** 35,500 **Ysm:** 245 **Tsi:** 60,200 **Tsm:** 415 **Grade:** X42 **Iso:** L290 **Ysi:** 42,100 **Ysm:** 290 **Tsi:** 60,200 **Tsm:** 415 **Grade:** X46 **Iso:** L320 **Ysi:** 46,400 **Ysm:** 320 **Tsi:** 63,100 **Tsm:** 435 **Grade:** X52 **Iso:** L360 **Ysi:** 52,200 **Ysm:** 360 **Tsi:** 66,700 **Tsm:** 460 **Grade:** X56 **Iso:** L390 **Ysi:** 56,600 **Ysm:** 390 **Tsi:** 71,100 **Tsm:** 490 **Grade:** X60 **Iso:** L415 **Ysi:** 60,200 **Ysm:** 415 **Tsi:** 75,400 **Tsm:** 520 **Grade:** X65 **Iso:** L450 **Ysi:** 65,300 **Ysm:** 450 **Tsi:** 77,500 **Tsm:** 535 **Grade:** X70 **Iso:** L485 **Ysi:** 70,300 **Ysm:** 485 **Tsi:** 82,700 **Tsm:** 570 **Grade:** X80 **Iso:** L555 **Ysi:** 80,500 **Ysm:** 555 **Tsi:** 90,600 **Tsm:** 625 **Notes:** Values are specified minimums. PSL 2 also sets maximum yield and tensile limits and requires toughness testing. Confirm values for your edition of API 5L / ISO 3183 and the purchase specification. For design stress, many pipeline codes use the specified minimum yield strength (SMYS). ## Content **Intro:** API 5L is the line pipe specification behind most oil and gas gathering and transmission pipe. The grade number after the X is the specified minimum yield strength in thousands of psi, so X52 is about 52,000 psi. This table lists the minimum yield and tensile strength for each grade, together with the ISO 3183 L grade name used outside the US. **Sections:** #### How to use the table **Body:** Search for a grade or a strength to filter the rows. Use the ISO column when a drawing from a European or Asian customer says L360 and your supplier quotes X52. Export the table to Excel to build a materials lookup for purchasing or an approved grade list in your ERP. The yield column is the value most design calculations use, for example the SMYS in a Barlow hoop stress check. #### Reading the grade name **Body:** In the X grades, the digits are the minimum yield strength in ksi, rounded: X42 is 42 ksi, X65 is 65 ksi. The ISO L grades use the minimum yield in MPa, rounded: L360 is 360 MPa. Grades A and B do not follow the X pattern. PSL 1 and PSL 2 are product specification levels, with PSL 2 adding chemistry limits, toughness testing and tighter strength windows. **Bullets:** - X42 to X80 minimum yield is about the number times 1,000 psi. - L number is minimum yield in MPa. - PSL 2 requires Charpy toughness testing in most cases. - Higher grade does not mean easier to weld. #### Worked example **Body:** A drawing calls for 12.75 inch OD pipe in L450. In the table, L450 is X65 with a minimum yield of 65,300 psi and a minimum tensile of 77,500 psi. A purchasing note that only says 'X65' leaves the PSL open, so the purchase order should state PSL 1 or PSL 2, the delivery condition and whether sour service or offshore supplementary requirements apply. #### Common mistakes **Body:** The usual mistakes are specifying a grade without a PSL, ordering a higher grade to 'be safe' and then struggling with welding procedures, and mixing the minimum yield with the actual mill test result when checking design margin. Also remember that a mill test report shows actual values, which are always above the minimums in this table. **Cta:** If approved pipe grades live in spreadsheets, we can help bring them into item master validation and receiving inspection in your ERP. **Faq:** #### What does the number in X52 mean? **Answer:** It is the specified minimum yield strength in thousands of psi, so X52 means about 52,000 psi. In the ISO 3183 naming, the equivalent grade is L360, where 360 is the minimum yield in megapascals. #### What is the difference between PSL 1 and PSL 2? **Answer:** PSL 2 has stricter requirements than PSL 1, including chemical composition limits, maximum strength limits and mandatory toughness testing. Many buyers specify PSL 2 for pipelines and critical service. The purchase order should always state the PSL. #### Can I use these values for design? **Answer:** They are the specified minimums and are commonly used as SMYS in pipeline design. The design code, such as ASME B31.4 or B31.8, sets the design factors and rules. Confirm the values against your edition of API 5L. #### Why is the tensile of X42 the same as grade B? **Answer:** In the specification, the minimum tensile strength is the same for grade B and X42, while the minimum yield differs. Always read both columns because the yield to tensile relationship matters for weld procedure qualification. ## Search terms API 5L grades yield strength, API 5L X52 yield strength, API 5L X65 tensile strength, API 5L grade B yield strength, L360 equals X52, API 5L X70 minimum yield, line pipe grade chart, API 5L PSL1 PSL2 grades --- Talk to an engineer: https://netray.co/contact?intent=erp_ai | Machine catalog: https://netray.co/agent/catalog.json