1.1 This specification pertains to 9% chromium- 1% molybdenum high alloy steel bar and tubing with a minimum yield strength of 80 ksi. Tubular products meeting the requirements of API 5CT L80 Type 9Cr meet the requirements of this specification. Bars and tubulars required to meet cold weather impact requirements shall be tested in accordance with the Supplemental Requirements. The 9% chromium steels are used primarily for downhole applications where wet CO2 is present: this material, though listed in NACE MR0175, has limited resistance to cracking in H2S containing environments.
2.1 API 5CT: Specification for Casing and Tubing
2.2 ASTM A29: General requirements for Steels Bar, Carbon and Alloy, Hot-Wrought and Cold- Finished
2.3 ASTM A370: Mechanical Testing of Steel Products
2.4 ASTM A388: Recommended Practice For Ultrasonic Examination of Heavy Steel Forgings
2.5 ASTM E18: Test Methods for Rockwell and Rockwell Superficial Hardness of Metallic
Materials
2.6 ASTM E213: Standard Practice for Ultrasonic Examination of Metal Pipe & Tubing
2.7 NAC 1R0175/ISO 15156: Petroleum and Natural Gas Industries – Materials for use in H2S Containing Environments in Oil and Gas Production
3.1 Chemical Composition: The chemical composition in weight percent shall meet the requirements listed in the Table below:
| C | Mn | Si | P | S | Ni | Mo | Cr | Cu/strong> | |
| Min. | — | 0.30 | — | — | — | — | 0.90 | 8.00 | — |
| Max. | 0.15 | 0.60 | 1.00 | 0.020 | 0.010 | 0.50 | 1.10 | 10.00 | 0.25 |
3.2 Mechanical Properties: The mechanical properties shall be determined at the mid radius location for bars and full wall (strip) section for tube in accordance with ASTM A370 and shall meet the requirements listed in the Table below:
| Yield Strength Ksi (MPa) | Tensile Strength ksi (MPa) | Elongation | Reduction Of Area 2 | Hardness Rockwell C | |
| Min. | 80.0 (552) | 95.0(655) | 16% | 35.0% | — |
| Max. | 95.0 ((655) | 120.0(827) | — | — | 23.0 (L80Tubing) 22.0 (Bar Product) |
3.3 Melt Practice: Steels made to this specification shall be electric furnace melted. The steel shall be produced using melt and refining practices proven capable of producing steels that are free from deleterious defects.
3.4 Condition: The Steel shall be furnished in the DH1150 condition.
3.5 Heat Treat Requirements for DH 1150 Condition: The following Table summarizes the temperature cycle requirements
| Yield Strength Ksi (MPa) | Tensile Strength ksi (MPa) | Elongation | Reduction Of Area 2 | Hardness Rockwell C | |||||
| Min. | 80.0 (552) | 95.0(655) | 16% | 35.0% | — | ||||
| Max. | 95.0 ((655) | 120.0(827) | — | — | 23.0 (L80Tubing) 22.0 (Bar Product) |
||||
| Note 1: Yield strength to be 0.2% offset for bars and 0.5% by extension for tubulars. | |||||||||
| Note 2: For tubular products, there is no requirement for reduction of area. | |||||||||
3.3 Impact Toughness: A set of three Charpy V Notch tests shall be run in accordance with API 5CT at 32°F (0°C) or lower. Not more than one of the three test specimens may exhibit an impact energy value less than the required average value as defined herein and in no case shall the value be below 2/3 of the required minimum average value. The use of sub-size specimens is not permitted without prior Engineering approval.
3.4 Melt Practice: Steels made to this specification shall be electric furnace melted, fully killed and ladle refined and/or vacuum degassed. The steel shall be produced using melt and refining practices proven capable of producing fine grained steels which are free from deleterious defect. The steel may be either ingot cast or continuous cast.
3.5 Heat Treatment and Condition: The steel shall be furnished in the hot worked and quenched and tempered condition. The quench may be an air (normalize) or liquid quench. Bars shall have a minimum reduction ratio of 5 to 1. The minimum tempering temperature shall be 1200°F (649°C).
3.6 Straightness and Tolerances: Tubing shall meet the dimensi al tolerances of API 5CT. For straightness, bars and tubing shall exhibit a chord height deviation of less than 0.2%.
4.1 Traceability: The heat identification shall be maintained through all stages of processing. The heat treat batch identities shall be maintained with the heat lot traceability.
4.2 Surface Quality: The bar shall be free cracks, laps, seams or other defects. Removal of surface defects to the limits of ASTM A29 for bar is acceptable,
4.3 Test Requirements: The tests required with frequency are defined in the following Table.
| Test Required | Test Frequency | Method & Acceptance Reference |
| Chemical Composition | Once per heat | Paragraph 3.1 |
| Tensile Properties | Once per heat & heat treat batch | Paragraph 3.2 as required by Supplement 10 |
| Surface Hardness | Once, each length or piece | Paragraph 3.2 |
| Impact Toughness | One set per heat & heat treat batch | Paragraph 3.3 |
| Volumetric Inspection | 100% Volumetric | When required by Supplement 1 |
| Low temperature toughness | One set per heat & heat treat batch | When required by Supplement 2 or 4 |
| Surface Inspection | 100% visual on each bar | Paragraph 4.2 |
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