Project Description
AISI 4145H MOD Alloy Steel
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
We are committed to integrate steel resources in china and serve the global steel market. Our company has more than 15 years of experience in steel researching, production, managing and sales. And our team mostly are based on and worked in national famous steel enterprise before. In the aspect of resources and information, we have established cooperative relationship with nearly hundred enterprises, either state-owned or private owned in China.
What’s more, we have built long, deep and close business relationship with dozens of steel company, Sharing and holding equities with several steel enterprises. Because of the close cooperation with steel companies and our pioneering spirit, which can ensure us stay at the top competition, and ensure our customers get what they really want. We provide preffesional one-stop service to the Contractors of follows project:
- Oil and Gas Pipeline Construction
- Onshore and Offshore
- Boiler Manufacturers
- Oil Refining Equipment
- Petroleum and Chemical Plant Construction
- Fire Protection
- Heating & Air Conditioning
Our ability to purchase materials directly from leading mills at the best possible price will give you the competitive edge. This coupled with a skilled workforce dedicated to embracing the demands of the markets we serve. Just give us a call +86-731-89903933.
