Steel pipe information: Differences between ASTM4140 seamless steel pipe and 41Cr4 seamless steel pipe
Hit：312026-04-13 15:08:54
Steel pipe information: Differences between ASTM4140 seamless steel pipe and 41Cr4 seamless steel pipe
The main differences between ASTM 4140 seamless steel pipe and 41Cr4 seamless steel pipe are the implementation standards, chemical composition range, mechanical property requirements, and applicable fields. The following is a comparative analysis based on authoritative public information:
1. Different execution standards
ASTM 4140: Following the American Society for Testing and Materials standards ASTM A29/A29M or ASTM A519, it belongs to the AISI/SAE system
41Cr4: Following the European standard EN 10083-1 (corresponding to DIN 17204), it belongs to the European EN system
4140 clearly contains molybdenum (Mo), significantly improving high-temperature strength, hardenability, and fatigue resistance; 41Cr4 does not contain forced molybdenum and relies on chromium to improve hardenability
Application and feature differences
ASTM 4140：
Due to its molybdenum content, it is more suitable for high temperature, high stress, and high fatigue environments (such as petroleum drilling tools and aviation components);
Used for deep well oil and gas pipes in API 5CT L80 level
Corresponding to the national standard of 42CrMo
41Cr4：
Commonly used for medium load shafts, gears, crankshafts, etc;
Poor weldability, prone to cracking
The corresponding national standard is 40Cr (note: not 42CrMo)
Note: Although 4140 is often referred to as corresponding to 42CrMo, 41Cr4 actually corresponds to 40Cr, and there are significant differences in their chemical composition and properties
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