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. 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.

Alloy Steel

We dealed with a 38CrMoAl Alloy Steel  project before with a middle east customer .

Order confirm of 38CrMoAl Alloy Steel round bar

Customer need 26 tons 1.8509 alloy steel, Otai Steel engineer suggest 38CrMoAl to them .There is rare 1.8509 stock material in China ,all of Chinese steel mill production 38CrMoAl instead of 1.8509.

Customer try to order 1.8550 /1.8507 /1.8519 instead of 1.8509 alloy steel round bar .and our engineer update the folow chemical composition as below to customer for reference . and customer Choose 38CrMoAl finally .

Grade Item C % Si % Mn % P % S % Cr % Mo % Al % Ni % V %
1.8509 Round Bar 0.38-0.45 0.20-0.40 0.40-0.70 ≤0.025 ≤0.035 1.50-1.80 0.20-0.35 0.80-1.20 * *
38CrMoAl Round Bar 0.35-0.42 0.20-0.45 0.30-0.60 ≤0.025 ≤0.035 1.35-1.65 0.15-0.25 0.70-1.10 * *
1.8550 Round Bar 0.30-0.38 ≤0.40 0.40-0.70 ≤0.025 ≤0.035 1.50-1.80 0.15-0.25 0.8-1.20 0.85-1.15 *
1.8507 Round Bar 0.30-0.37 ≤0.40 0.40-0.70 ≤0.025 ≤0.035 1.0-1.13 0.15-0.25 0.8-1.2 * 0.1-0.2
1.8519 Round Bar 0.27-0.34 ≤0.40 0.40-0.70 ≤0.025 ≤0.035 2.3-2.7 0.15-0.25 * * *

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 .

1.First ,the goods is Hot Rolled,Black Surface ,and there is reasonable with rusted ,Black sueface means the item is Ex-mill condition cover with Oxide Layer.

If you want the steel without the any rusted, the surface is Bright Surface with Polish process.

Alloy Steel Black surface + Bright Surface

2.About the unit weight  and Label “38CrMoALA”, each of the sizes produced in a factory and aligned with the printed label.

3.About the Diameter ,The inspector did not use the Vernier Caliper to check it. AGS is the first one who use the length ruler to check it.

Size test of alloy steel

After the long meeting with customer , they agree our test report instead of AGS .and finished 38CrMoAl Alloy Steel round bar shipment and payment process as usually .

Ms Elwa Lee

Mobile/WhatsApp: 0086-15899675236

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Elwa@otaisteel.com