AISI304 316 440C 2 inch Diameter Chrome Steel Bearing Balls G100 Ball Bearings
SAE International, as a standards organization, maintains several alloy numbering systems, one of which, for steel grades, is the SAE steel grades system.
In the 1930s and 1940s the American Iron and Steel Institute (AISI) and SAE were both involved in efforts to standardize such a numbering system for steels. These efforts were similar and overlapped significantly. For several decades the systems were united into a joint system designated the AISI/SAE steel grades. In 1995 the AISI turned over future maintenance of the system to SAE because the AISI never wrote any of the specifications.
Today steel quotes and certifications commonly make reference to both SAE and AISI, not always with precise differentiation. For example, in the alloy/grade field, a cert might say "4140", "AISI 4140", or "SAE 4140", and in most light-industrial applications any of the above is accepted as adequate, and considered equivalent, for the job at hand, as long as the specific specification called out by the designer (for example, "4140 bar per ASTM-A108" or "4140 bar per AMS 6349") is certified to on the certificate. The alloy number is simply a general classifier, whereas it is the specification itself that narrows down the steel to a very specific standard.
Welding
Excellent weldability by all standard fusion methods, both with and without filler metals. AS 1554.6 pre-qualifies welding of 304 with Grade 308 and 304L with 308L rods or electrodes (and with their high silicon equivalents). Heavy welded sections in Grade 304 may require post-weld annealing for maximum corrosion resistance. This is not required for Grade 304L. Grade 321 may also be used as an alternative to 304 if heavy section welding is required and post-weld heat treatment is not possible.
Machining
A "Ugima" improved machinability version of grade 304 is available in bar products. "Ugima" machines significantly better than standard 304 or 304L, giving higher machining rates and lower tool wear in many operations.
Dual Certification
It is common for 304 and 304L to be stocked in "Dual Certified" form, particularly in plate and pipe. These items have chemical and mechanical properties complying with both 304 and 304L specifications. Such dual certified product does not meet 304H specifications and may be unacceptable for high temperature applications.
Physical properties of 304 grade stainless steel in the annealed condition
TABLE1- TYPICAL ROOM TEMPERATURE MECHANICAL PROPERTIES | ||||||||
UTS kSI.(MPa) | 0.2%YS ksi.(MPa) | Elongation% in 2"(50.8mm) | Rockwell Hardness | |||||
Type 304 | 95(566) | 42(290) | 55 | B84 | ||||
Type 304L | 95(566) | 42(275) | 55 | B82 |
TABLE1- TYPICAL ROOM TEMPERATURE MECHANICAL PROPERTIES | ||||||||
UTS kSI.(MPa) | 0.2%YS ksi.(MPa) | Elongation% in 2"(50.8mm) | Rockwell Hardness | |||||
Type 304 | 95(566) | 42(290) | 55 | B84 | ||||
Type 304L | 95(566) | 42(275) | 55 | B82 |
TABLE3-LOW TEMPERATURE MECHANICAL PROPERTIES | ||||||||
Condition | Temperature ℉(℃) | UTS kSI.(MPa) | 0.2%YS ksi.(MPa) | Elongation% in 2"(50.8mm) | ||||
Annealed | _320(_196)) | 235(1620) | 56(386) | 40 | ||||
_80(_62) | 161(1110) | 50(345) | 57 | |||||
_40(_40) | 145(1000) | 48(331) | 60 | |||||
32(0) | 122(841) | 40(296) | 65 | |||||
70(21) | 85(586) | 35(241) | 55 |
AISI Number | C % | Si % | Mn % | Cr % | Ni % | Mo % | P % | S % | Character |
AISI 302 | 0.15 Max | 1.00 Max | 2.00 Max | 17.0~ 19.0 | 8.0~ 10.5 | 0.045 Max | 0.03 Max | Slightly magnetic Austinitic | |
AISI 304 | 0.07 Max | 1.00 Max | 2.00 Max | 17.0~ 19.0 | 8.50~ 10.5 | 0.045 Max | 0.03 Max | Slightly magnetic Austinitic | |
AISI 316 | 0.07 Max | 1.00 Max | 2.00 Max | 16.5~ 18.5 | 10.5~ 13.5 | 2000~ 2.50 | 0.045 Max | 0.03 Max | Non magnetic Austinitic Excellent corrosion resistance |
AISI 420J | 0.17~ 0.25 | 1.00 Max | 1.00 Max | 12.0~ 14.0 | 0.045 Max | 0.03 Max | magnetic Hardenable HRC 48 Min fair corrosion resistance | ||
AISI 430 | 0.08 max | 1.00 Max | 1.00 Max | 15.5~ 17.5 | 0.045 Max | 0.03 Max | fair- good corrosion resistance | ||
AISI 440C | 0.95~ 1.20 | 1.00 Max | 1.00 Max | 16.0~ 18.0 | 0.40~ 0.80 | 0.04 Max | 0.02 Max | fair corrosion resistance Hardenable HRC 58 Min |
Corrugated box and opp bag and foam
Wild range of selection of various sizes and materials