voodoo自行车架.docVIP

/newbbs/dispbbs.asp?boardid=10replyid=627895id=162782skin=0page=1star=3 voodoo车架断裂讨论帖 /bbs/viewthread.php?tid=59634extra=page%3D55page=3 搬运工 SEAMLESS AIR-HARDENING HEAT-TREATED STEEL UTS: 1250-1400 MPa, density 7.78 gm/cc The benefits of an air-hardening steel are particularly noticeable in the weld area where, unlike conventional steel alloys, strength can actually increase after cooling in air immediately after welding. This feature is a result of the fine grain structure due to the chemical compostion specified. 853 is heat-treated to give high strength and damage resistance. THE RIDE OF STEEL. Brass Brazing As the name implies, brazing is usually done with a filler made of some form of brass or bronze, alloys of copper with zinc, tin, and other metals. Brass and bronze brazing alloys typically melt at temperatures over 1500F, sometimes as high as 2000F. This is hot enough to anneal steel, destroying any strength added through heat treatment. For this reason, heat-treated bicycle tubing such as Reynolds 731 should not be brass brazed. For tubing that has not been heat treated, such as Reynolds 531 or plain 4130 chromoly steel, brass brazing is entirely appropriate. It produces joints that are more than strong enough for a bicycle frame, it costs much less than silver, and it is a more forgiving process, allowing wider tolerances in tube mitering and temperature control. The vast majority of brazed production bicycle frames, and a large share of custom frames, are all brass or bronze brazed. Especially for a beginning frame builder, brass is often a good choice. REYNOLDS 853 / 853OS info Reynolds 853 is a high strength, 210,00 psi, heat treated, air hardened steel alloy. Careful control of the alloying elements combine to give these tubes enhanced mechanical properties surpassing other materials currently available. The main advantage of Reynolds 853 is its ability to air harden after joining, a characteristic not shown by other chrome molybdenum / manganese m