4145H MOD Alloy Steel
4145H MOD Alloy Steel Drill Collars
4145H MOD Alloy Steel forged bar
4145H MOD Alloy Steel stabilizer
Description
AISI 4145H 120 ksi, API 7-1 Standards is a chromium molybdenum quality alloy steel specification. As a high tensile steel grade AISI 4145H MOD is primarily supplied in the hardened and tempered condition to 30-36HRc range to AISI 4145H MOD. With a slightly higher carbon content AISI 4145H MOD is similar to AISI 4140 in that it offers good ductility, shock resisting characteristics combined with resistance to wear.
Advantages:
1 QTC Qualification Test Coupon Passed
2 Superior Hardenability
3 Optimize chemical component
Applications
AISI 4145H MOD Steel is commonly used for a variety of applications in the oil and gas sector. Used often for the manufacture of down hole drilling tools such as drill collars. Other applications include gears, shafts for hydraulic presses, rolls for paper mills, pump shafts and tool holders.
Chemical Composition
| Grade | C | Mn | Cr | Mo | Si | P | S | Ni | Cu | V | Al% | H max. ppm |
| Min. | 0.420 | 0.800 | 0.850 | 0.150 | 0.150 | – | – | – | – | – | 0.020 | – |
| Max. | 0.450 | 1.200 | 1.200 | 0.250 | 0.350 | 0.025 | 0.025 | 0.250 | 0.300 | 0.300 | 0.035 | 1.500 |
Heat Treatment
| Normalizing temperature | Time | Austenizing temperature | Time | Tempering temperature | Time |
| 1600 – 1750℉ (871 – 960℃) | Min. 60 minutes | 1562 – 1675℉ (850 – 913℃) | Min. 60 minutes | 1050℉ (566℃) | Min. 60 minutes |
Oil or Polymer or Water. For Water Quenching, the temperature of water shall not exceed 38℃ (100℉) at start of quench. For bath-type quenching, the temperature of water shall not exceed 49℃(120℉) at any time during the quench cycle.
Mechanical Properties
as per ASTM A370 – 20
| Yield strength minimum (0.2% offset) | Tensile strength minimum | Elongation in 2” (minimum) | Reduction Area (minimum) |
| 120,000 psi (828 MPa) | 140,000 psi (966 MPa) | 18% | 45% |
Quality Inspection
- Specimen test location & QTC
- Charpy V-notch impact at 21℃ / -32℃
- Hardness as per ASTM E10-18: On surface / 1”below surface
- Volumetric NDE 100% – Ultrasonic
- Minimum hot work reduction ratio 4.0 to 1
- Grain size should be #S or Finer as per ASTM E112 – 13
- Surface inspection
