{"id":4591,"date":"2026-07-08T12:32:37","date_gmt":"2026-07-08T12:32:37","guid":{"rendered":"https:\/\/beiyutitanium.com\/cp-titanium-grades-1-2-3-4-selection\/"},"modified":"2026-07-30T01:13:27","modified_gmt":"2026-07-30T01:13:27","slug":"cp-titanium-grades-1-2-3-4-selection","status":"publish","type":"post","link":"https:\/\/beiyutitanium.com\/de\/cp-titanium-grades-1-2-3-4-selection\/","title":{"rendered":"Commercially Pure Titanium Grades 1-4: How to Choose the Right One"},"content":{"rendered":"

The four commercially pure (CP) titanium grades share similar corrosion behavior but differ in strength and formability. Picking the wrong one means either paying for strength a part does not need or specifying a grade that cannot form or machine the way the job requires. This guide covers what separates Grades 1 to 4, which grade fits which service, and the standard and form to state on the order.<\/p>\n

Beiyu Titanium supplies CP titanium in all four grades, Grade 1 through Grade 4, as bar, sheet and plate, tube, and wire. EN 10204 3.1 documentation and heat or lot traceability are available by order scope; list the required results and identifiers with the CP-grade enquiry.<\/p>\n

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When the selection is for implant manufacture, Beiyu’s titanium for medical implants hub<\/a> separates the ASTM F67 CP grades from Ti-6Al-4V implant specifications and the ISO 5832 system.<\/p>\n

What actually separates CP Grades 1 to 4?<\/h2>\n

All four are unalloyed titanium. The main compositional difference is the controlled level of oxygen and iron, which climbs from Grade 1 to Grade 4 and pulls strength up while pulling ductility down. Corrosion resistance is broadly similar across all four, so the grade choice is usually a strength-versus-formability decision, not a corrosion one.<\/p>\n\n\n\n\n\n\n\n\n
G\u00fcte<\/th>\nUNS<\/th>\nOxygen, max<\/th>\nTensile min<\/th>\nYield min<\/th>\nCharacter<\/th>\n<\/tr>\n<\/thead>\n
Grade 1<\/td>\nR50250<\/td>\n0.18%<\/td>\n240 MPa (35 ksi)<\/td>\n138 MPa (20 ksi)<\/td>\nSoftest, most formable<\/td>\n<\/tr>\n
Grade 2<\/td>\nR50400<\/td>\n0.25%<\/td>\n345 MPa (50 ksi)<\/td>\n275 MPa (40 ksi)<\/td>\nBalanced workhorse<\/td>\n<\/tr>\n
Grade 3<\/td>\nR50550<\/td>\n0.35%<\/td>\n450 MPa (65 ksi)<\/td>\n380 MPa (55 ksi)<\/td>\nH\u00f6here Festigkeit<\/td>\n<\/tr>\n
Grade 4<\/td>\nR50700<\/td>\n0.40%<\/td>\n550 MPa (80 ksi)<\/td>\n483 MPa (70 ksi)<\/td>\nStrongest CP grade<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Values shown are ASTM B348 bar and billet minimums; confirm against the current revision and the applicable product standard, since medical work under ASTM F67 can differ from ASTM B348 on a few figures.<\/em><\/p>\n

Which grade for corrosion service, and why is Grade 2 the default?<\/h2>\n

For chemical processing, marine and desalination, oil and gas, and most industrial corrosion service, Grade 2<\/strong> is the default and the most-ordered CP grade. Beiyu supplies Grade 2 into chemical equipment and heat exchangers, marine and desalination hardware, and oil and gas corrosion service. It carries the full CP corrosion behavior with enough strength for piping, vessels, heat-exchanger components and structural parts, and it welds and forms well. Because corrosion behavior is common to the CP family, moving away from Grade 2 is usually driven by a strength or forming need, not a corrosion one. See our chemical industry<\/a> und marine engineering<\/a> applications.<\/p>\n

For bar-focused RFQs, see Beiyu’s Grade 2 Titanstange<\/a> page and the Leitfaden f\u00fcr Titanstangen und Kn\u00fcppel nach ASTM B348<\/a>.<\/p>\n

When do you drop to Grade 1, or step up to Grade 3 and 4?<\/h2>\n