GOST 5949-75. Stal sortovaya i kalibrovannaya korrozionno-stoykaya, garostoykaya i garoprochnaya

Nastoyashchiy standart rasprostranyaetsya na goryachekatanuyu i kovanuyu stal diametrom, storonoy kvadrata ili tolshchinoy do 200 mm; kalibrovannuyu stal diametrom ili storonoy kvadrata do 70 mm; so spetsialnoy otdelkoy poverhnosti korrozionnostoykuyu, garostoykuyu i garoprochnuyu.

1. KLASSIFIKATSIYA

   1.1. Po vidu izgotovleniya stal delitsya: goryachekatanaya i kovanaya; kalibrovannaya; so spetsialnoy otdelkoy poverhnosti.

   1.2. Goryachekatanaya i kovanaya stal v zavisimosti ot naznacheniya delitsya na podgruppi:

   • a — dlya goryachey obrabotki davleniem i holodnogo volocheniya;
   • b — dlya mehanicheskoy obrabotki (tocheniya, stroganiya, frezerovaniya i dr.).

   Primechanie.Po soglasovaniyu megdu potrebitelem i izgotovitelem kruglie prutki, prednaznachennie dlya goryachey obrabotki davleniem i holodnogo volocheniya, izgotovlyayut s obtochennoy ili obodrannoy poverhnostyu.

   1.3. Po sostoyaniyu materiala stal delitsya:

   • nagartovannaya — N;
   • bez termicheskoy obrabotki;
   • termicheski obrabotannaya (otoggennaya ili otpushchennaya) — T.

   1.4. Vid izgotovleniya, naznacheniya i sostoyaniya materiala ukazivayut v zakaze.

2. SORTAMENT

   2.1. Sortament, forma i razmeri stali dolgni sootvetstvovat trebovaniyam:

   • goryachekatanoy krugloy — GOST 2590—88;
   • goryachekatanoy kvadratnoy,— GOST 2591—88;
   • kovanoy krugloy i kvadratnoy — GOST 1133—71;
   • goryachekatanoy i kovanoy polosovoy — GOST 4405—75;
   • goryachekatanoy polosovoy — GOST 103—76;
   • goryachekatanoy shestigrannoy—GOST 2879—88;
   • kalibrovannoy krugloy—GOST 7417—75;
   • kalibrovannoy kvadratnoy — GOST 8559—75;
   • kalibrovannoy shestigrannoy — GOST 8560—78;
   • so spetsialnoy otdelkoy poverhnosti — GOST 14955—77.

   Primeri uslovnih oboznacheniy:

   • 1). Stal goryachekatanaya, kruglaya, diametrom 40 mm, obichnoy tochnosti prokatki (V) po GOST 2590—71, marki 12H18N9 dlya holodnoy mehanicheskoy obrabotki (podgruppa b):

                   40 -V GOST2590-71
     Krug ----------------------------------------
              12H18N9 - b GOST 5949-75

   • 2). Stal goryachekatanaya, kvadratnaya, so storonoy kvadrata 48 mm, obichnoy tochnosti prokatki (V) po GOST 2591—71, marki 13H11N2V2MF, dlya goryachey obrabotki davleniem (podgruppa a), variant mehanicheskih svoystv 2, termicheski obrabotannaya:

                           48-V GOST2591-71
     Kvadrat -----------------------------------------------------
                     13H11N2V2MF-a-2-T GOST 5949-75

   • 3). Stal goryachekatanaya, polosovaya,, tolshchinoy 32 mm, shirinoy 120 mm, normalnoy tochnosti prokatki (B) s serpovidnostyu po klassu 2 GOST 103-76, marki 10H17N13M2Tdlya mehanicheskoy ob-rabotki, termicheski obrabotannaya:

                      32 h 120-B-2 GOST 103-76
     Polosa---------------------------------------------------
                    10H17N13M2T-6-T GOST 5949-75

   • 4). Stal kalibrovannaya, shestigrannaya, diametrom vpisannogo kruga 12 mm, s predelnimi otkloneniyami po h GOST 8560—78, marki 07H16N6:

                                   2-h„ GOST 8560-78
     SHestigrannik -------------------------------------
                                07H16N6 GOST 5949-75

   • 5). Stal so spetsialnoy otdelkoy poverhnosti, kruglaya, diametrom 9.8 mm, klass tochnosti Za po GOST 14955—77, marki 08H18N10T, kachestva poverhnosti gruppi (V) po GOST 14955—77, termicheski obrabotannaya:

               9.8-Za GOST 14955-77
     Krug ----------------------------------------------------
               08H18N10T-V-T GOST 5949- 75




3. TEHNICHESKIE TREBOVANIYA

   3.1a. Stal sortovaya i kalibrovannaya korrozionnostoykaya, garoprochnaya i garostoykaya dolgna izgotovlyatsya v sootvetstvii s trebovaniyami nastoyashchego standarta i tehnologicheskomu reglamentu, utvergdennomu v ustanovlennom poryadke.

   3.1. Sortovuyu stal, kalibrovannuyu i stal so spetsialnoy otdelkoy poverhnosti izgotovlyayut iz marok, ukazannih v prilogenii 1, kalibrovannuyu shestigrannuyu — iz marok, ukazannih v prilogenii 2.

   3.2. Himicheskiy sostav stali dolgen sootvetstvovat — GOST 5632-72.

   3.3. Goryachekatanuyu i kovanuyu stal izgotovlyayut termicheski obrabotannoy ili termicheski neobrabotannoy, kalibrovannuyu stal so spetsialnoy otdelkoy poverhnosti — termicheski obrabotannoy ili nagartovannoy. Stal martensitnogo i martensitnoferritnogo klassa izgotavlivayut v termicheski obrabotannom sostoyanii. Po trebovaniyu potrebitelya stal austenitnogo klassa izgotovlyayut v zakalennom sostoyanii .

   3.4. Tverdost goryachekatanoy i kovanoy stali v otoggennom ili otpushchennom sostoyanii, a takge kalibrovannoy stali i so spetsialnoy otdelkoy poverhnosti v otoggennom sostoyanii dolgna sootvetstvovat normam, ukazannim v tabl. 1. Tverdost goryachekatanoy i kovanoy stali v otoggennom ili otpushchennom sostoyanii marok, ne ukazannih v tabl. 1, a takge kalibrovannoy i so spetsialnoy otdelkoy poverhnosti stali v nagartovannom sostoyanii ustanavlivaetsya po soglasovaniyu megdu izgotovitelem i potrebitelem.

3.5. Na poverhnosti goryachekatanoy i kovanoy stali, prednaznachennoy dlya goryachey obrabotki davleniem i holodnogo volocheniya (podgruppa a), ne dolgno bit treshchin, plen, zakatov. Mestnie defekti dolgni bit udaleni pologoy virubkoy ili zachistkoy, shirina kotoroy dolgna bit ne menee pyatikratnoy glubini. Glubina zachistki defektov ne dolgna previshat sleduyushchih velichin: dlya stali razmerom 40 mm i menee - summi predelnih otkloneniy (diametra ili tolshchini); dlya stali razmerom sv. 40 do 140 mm - 5 % razmera (diametra ili tolshchini); dlya stali razmerom sv. 140 do 200 mm - 8 % razmera (diametra ili tolshchini). Na poverhnosti stali dopuskayutsya bez zachistki otdelnie melkie riski, otpechatki i ryabizna v predelah polovini summi predelnih otkloneniy, a takge raskatannie i raskovannie puziri glubinoy, ne previshayushchey 1/4 summi predelnih otkloneniy. Glubina zachistki dopuskaemih defektov schitaetsya ot fakticheskogo razmera. Primechanie. Na poverhnosti stali, prednaznachennoy dlya izgotovleniya detaley metodom goryachey osadki i visadki, chto dolgno bit ukazano v zakaze, raskatannie i raskovannie puziri ne dopuskayutsya.

3.6. Na poverhnosti goryachekatanoy i kovanoy stali, prednaznachennoy dlya holodnoy mehanicheskoy obrabotki (podgruppa b) mestnie defekti ne dopuskayutsya, esli ih glubina previshaet: dlya stali razmerom 80 mm - 3/4 summi predelnih otkloneniy (diametra ili tolshchini); dlya stali razmerom sv. 80 do 150 mm - 4 % razmera (diametra ili tolshchini); dlya stali razmerom sv. 150 mm - 5 % razmera (diametra ili tolshchini). Glubina zaleganiya defektov schitaetsya ot nominalnogo razmera.

3.7. Kachestvo poverhnosti kalibrovannoy stali dolgno sootvetstvovat trebovaniyam GOST 1051-73 gruppi V, stali so spetsialnoy otdelkoy poverhnosti ili obtochennoy GOST 14955-77 grupp B, V, G, D. Gruppa poverhnosti ukazivaetsya v zakaze.

3.8. Prutki, narezannie na pressah ili pod molotami, mogut imet smyatie kontsi, zausentsi na kontsah prutkov po trebovaniyu potrebitelya dolgni bit zachishcheni.

3.9. Stal podgruppi a, prednaznachennaya dlya goryachey osadki ili visadki, chto dolgno bit ukazano v zakaze, podvergayut ispitaniyu na osadku v goryachem sostoyanii. Na osagennih obraztsah ne dolgno bit nadrivov i treshchin. Predpriyatiyu-izgotovitelyu razreshaetsya ne provodit ispitanie na osadku stali diametrom ili tolshchinoy svishe 80 mm.

3.10. Mehanicheskie svoystva vseh marok stali i tvyordost stali marok 30H13, 40H13, 95H18, opredelennie na obraztsah, dolgni sootvetstvovat normam, ukazannim v tablitsah.