Machine Drawing

Annexure

Table 1 Tensile properties of standard steels

σUt σY

New Designation Old Designation

Nmm/^2 Nmm/^2

Fe 290 (St 30) 290 170

FeE 220 — 290 220

Fe 310 (St 32) 310 180

Fe 230 — 310 230

Fe 330 (St 34) 330 200

FeE 250 — 330 250

Fe 360 (St 37) 360 220

FeE 270 — 360 270

Fe 410 (St 42) 410 250

FeE 310 — 410 310

Fe 490 (St 50) 490 290

FeE 370 — 490 370

Fe 540 (St 55) 540 320

FeE 400 — 540 400

Fe 620 (St 63) 620 380

FeE 460 — 620 460

Fe 690 (St 70) 690 410

FeE 520 — 690 520

Fe 770 (St 78) 770 460

FeE 580 — 770 580

Fe 870 (St 88) 870 520

FeE 650 — 870 650

Table 2 Tensile properties of carbon steels (unalloyed) (stress values in N/mm^2 )

Condition Hot rolled or Cold drawn Hardened and Cast hardened

normalised (20 to 40 mm dia) tempered refined and

quenched

Designation (core properties)

New Old σUt σUt σUt σUt

7C4 C07 320–400

10C4 C10 340–420 450 500

14C6 Cl4 370–450 500

15C8 C15Mn75 420–500 510 500

20C8 C20 440–520 510 500

25C8 C25Mn75 470–570

30C8 C30 500–600 570 600

35C8 C35Mn75 550–650 600

40C8 C40 580–680 610 700

50C4 C50 600–780 630 800

NOTE—Yield stress may be taken as 55 to 65% of ultimate stress unless otherwise specified.

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