Os rhagwelir ffurfiant sigma, dylid cymryd gofal i osgoi effaith mecanyddol trwm ar dymheredd ystafell. Mae gan 309 raddfa machinability o 43 y cant o'i gymharu â dur AISI B1112. Argymhellir ffurfio tymheredd ystafell. Weld gydag electrodau gorchuddio AWS E309-16 neu wifren noeth ER309.
Graddau amgen posibl i ddur di-staen gradd 309/309s
| EN-safon Dur dim. khs DIN | EN-safon Enw dur | gradd SAE | UNS |
| 1.4109 | X65CrMo14 | 440A | S44002 |
| 1.4112 | X90CrMoV18 | 440B | S44003 |
| 1.4125 | X105CrMo17 | 440C | S44004 |
| 440F | S44020 | ||
| 1.4016 | X6Cr17 | 430 | S43000 |
| 1.4408 | GX 6 CrNiMo 18-10 | 316 | S31600 |
| 1.4512 | X6CrTi12 | 409 | S40900 |
Tagiau poblogaidd: dur plât di-staen 309, Tsieina, cyflenwyr, gweithgynhyrchwyr, ffatri, prynu, pris, pricelist, ar werth, mewn stoc, sampl am ddim
Pâr o: Platiau Dur 309 Ss
Nesaf: 309 Plât Dur Ss Di-staen
