Product introduction
38CrMoAl hot rolled steel round bars information
A Small Story of 38CrMoAl Special Alloy Steel Round Bar. 38CrMoAl is a nitrided Alloy Steel with high wear resistance, high fatigue strength and high strength. It is mainly used for nitrided parts with precise dimensions after heat treatment, or various nitrided parts with low impact load and high wear resistance
It is mainly used for nitrided parts with precise dimensions after heat treatment, or various nitrided parts with low impact load and high wear resistance. Such as boring bar, grinding machine spindle, automatic lathe spindle, worm, precision screw, precision gear. And also such as High-pressure valves, valve stems, gauges, templates, rollers, replicas, cylinder blocks, compressor piston rods, governors on steam turbines, rotating sleeves, fixing sleeves, various wear-resistant parts on rubber and plastic extruders, etc.
Chemical and Mechanical
38CrMoAl steel chemical composition:
| Materail | Chemical Composition % |
| | C | Si | Mn | S/P | AL | Cr | Mo |
| 38CrMoAl | 0.35-0.42 | 0.20-0.45 | 0.30-0.60 | 0.030 max | 0.70-1.10 | 0.80-1.10 | 0.15-0.25 |
38CrMoAl steel mechanical properties:
| Mechanical Properties |
| Yield Strength (MPa) | Tensile Strength (MPa) | Elongation | Reduction of area | |
| 980 min | 830 min | 12% min | 50% min | |
The order delivery condition as follow :
–1.Hot Rolled；;Black Surface
–2.Hardness:160~260HB
–3.Length:4000~6000mm
–4.UT-SEP 1921C/C or Better
–5.Chmical Analyzed 38CrMoAl ( or 1.8509 )
–6.Fix Diameter ( Accept the tolerance -/+1.5mm)
–7.SGS or other third party inspection under buyer‘s arrangement
As we prepared the goods ,and informed customer to arrange third party inspeaction .
Order inspector of 38CrMoAl Alloy Steel Round bar .
The customer arrange AGS test for the goods . (test the Diameter / Length / Qty (PC) and weight before loading by container )
And there is feedback of the test is ” Uncceptable “for the goods .
Test feedback as follow :
1.The inspection result was failed due to there was rusty mark on almost all the products
2.There was no scale provided for unit weight check;
3.The actual material on labels was “38CrMoALA” not conformed to the client spec “38CrMoAl”
4.For the diameter check, for item 3-75×6000-7500mm, the actual diameter was 73mm. For item 4-80×6000-7500mm, the actual diameter was 78mm .For item 5-85×6000-7500mm, the actual diameter was 83mm.
For hardness check, material strength test, stainless steel material check, chemical composition analysis, there was no equipment or testing report provided on site.so customer accept our QC’s material test report .
After our QC feedback for the test process of inspector,the inspector did not do the steel test before ,and there without some mistake of the test way .
The process flow of nitriding parts is generally: forging → normalizing (annealing) → rough machining → tempering and tempering → finishing machining → de-stress → fine grinding → nitriding → fine grinding → assembly.
The purpose of 38CrMoAl nitriding treatment is mainly for wear resistance.After nitriding, its hardness is as high as HV800, the hardened layer can reach 0.30mm ~ 0.5mm.
38CrMoAl is mainly used in the manufacture of parts with precise size, requiring high wear resistance and fatigue strength, and not subjected to large impact load, such as cylinder liner, bottom sleeve, gear, bolts, shaft and rotor, etc.
In addition, because Al and Cr elements can form a dense passivation film on the surface of steel, so 38CrMoAl is also a kind of seawater corrosion resistant steel.Its seamless steel pipe is the most ideal pipeline and processing material for transporting water, oil and gas and seawater containing medium in coastal power plants, coastal oil fields, coastal natural gas and petrochemical plants.
