MIL-T-6736B, MILITARY SPECIFICATION, TUBING, CHROME-MOLYBDENUM, 4130 STEEL, SEAMLESS AND WELDED, AIRCRAFT QUALITY (3 MAY 1965) [REFER TO SAE-AMS-T-6736 AS A POSSIBLE REPLACEMENT]., This specification covers chromium-molybdenum (4130) seamless and welded steel tubing of aircraft quality.