321 Stainless Steel Machinability

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321 Stainless Steel Machinability and Machining

Grade 321 stainless steel machinability is 36% in annealed conditoin based on a machinability rating of 100% for 1212 steel.

Nominal speeds and feeds for turning a variety of steels and cast irons with high-speed steel (HSS) single-point and box tools
Material Hardness, HB Condition Depth of cut, mm (in) High-speed steel tool Tool material
Speed Feed
m/min sfm mm/rev in./rev ISO AISI
Wrought austenitic SS321 135-185 Annealed 1 (0.04) 34 110 0.18 0.007 S4, S5 M2, M3
4 (0.15) 27 90 0.4 0.015
8 (0.30) 21 70 0.5 0.02
16 (0.625) 17 55 0.75 0.03
Nominal speeds and feeds for turning a variety of steels and cast irons with carbide-tipped single-point and box tools
Material Hardness, HB Condition Carbide tool
Uncoated Coated
Speed Feed Tool material grade Speed Feed Tool material grade
Brazed Indexable
m/min sfm m/min sfm mm/rev in./rev ISO C m/min sfm mm/rev in./rev ISO C
Wrought austenitic SS321 135-185 Annealed 105 350 120 400 0.18 0.007 K01, M10 C-3 160 525 0.18 0.007 CK01, CM10 CC-3
100 325 105 350 0.4 0.015 135 450 0.4 0.015
76 250 84 275 0.5 0.02 C-2 105 350 0.5 0.02 CC-2
60 200 64 210 0.75 0.03 K20, M20
Nominal speeds and feeds for turning a variety of steels and cast irons with ceramic tools
Material Hardness, HB Condition Depth of cut, mm (in) Speed Feed Type of ceramic
m/min sfm mm/rev in./rev
Austenitic SS321 135-185 Annealed 1 (0.040) 425 1400 0.13 0.005 Cold-pressed alumina
4 (0.150) 275 900 0.25 0.010
8 (0.300) 185 600 0.40 0.015
Nominal speeds and feeds for turning a variety of steels and cast irons with high-speed steel and carbide cutoff and form tools
Material Hardness, HB Condition Speed Feed, mm/rev (in./rev) Tool material grade
Cutoff tool width Form tool width
m/min sfm 1.5 mm (0.062 in.) 3 mm (0.125 in.) 6 mm (0.250 in.) 12 mm (0.500 in.) 18 mm (0.750 in.) 25 mm (1.00 in.) 35 mm (1.50 in.) 50 mm (2.00 in.) ISO AISI or C
Austenitic SS321 135-185 Annealed 26 85 0.033 (0.0013) 0.041 (0.0016) 0.050 (0.002) 0.050 (0.002) 0.041 (0.0016) 0.036 (0.0014) 0.030 (0.0012) 0.025 (0.001) S4, S5, K40, M40 M2, M3, C-2
84 275
Speeds and feeds for the deep-hole trepanning of various steels with high-speed tool steels and carbide tools
Material Hardness, HB Condition Speed Feed Tool material grade
m/min sfm mm/rev in./rev ISO AISI or C
Austenitic: SS321 135-185 Annealed 20 65 0.075 0.003 S4, S5 M2, M3
84 275 0.15 0.006 K20 C-2
225-275 Cold drawn 18 60 0.075 0.003 S4, S5 M2, M3
69 225 0.10 0.004 K20 C-2
Nominal speeds for the thread grinding of ferrous alloys and carbides
Material Hardness, HB Condition Thread designation Wheel identification ANSI Wheel speed Work speed
Pitch, mm Threads per 25 mm (1 in.) m/s sfm m/min sfm
Wrought austenitic stainless steels: 321, 201, 202, 301, 302, 302B, 304, 304L, 305, 308, 309, 309S, 310, 310S, 314, 316, 316L, 317, 330, 347, 348, 384, 385 135-275 Annealed or cold drawn 6-2.5 4-12 A90RB 43 8,500 1.2 4.0
2-1 13-27 A120SB 46 9000
0.8-0.45 28-63 A180TB 48 9500
0.4-0.35 64-80 A220UB 51 10000
Recommended speeds and feeds for the face milling of ferrous and nonferrous alloys with both high-speed steel and carbide cutters
Material Hardness, HB Condition Depth of cut, mm (in.) High-speed steel tool Carbide tool
Uncoated Coated
Speed Feed per tooth, mm (in.) Tool material grade, ISO (C) Speed, m/min (sfm) Feed per tooth, mm (in.) Tool material grade, ISO (C)
Speed, m/min (sfm) Feed per tooth, mm (in.) Tool material, ISO (AISI) Brazed, m/min (sfm) Indexable, m/min (sfm)
Wrought austenitic stainless steel 321 135-185 HB Annealed 1 (0.040) 40 (130) 0.20 (0.008) S4, S2 (M2, M7) 130 (430) 145 (475) 0.20 (0.008) K10, M20 (C-2) 215 (700) 0.20 (0.008) CK10, CM20 (CC-2)
4 (0.150) 30 (100) 0.30 (0.012) S4, S2 (M2, M7) 100 (325) 110 (360) 0.30 (0.012) K20, M30 (C-2) 145 (475) 0.30 (0.012) CK20, CM30 (CC-2)
8 (0.300) 24 (80) 0.40 (0.016) S4, S2 (M2, M7) 70 (230) 85 (280) 0.40 (0.016) K30, M40 (C-2) 105 (350) 0.40 (0.016) CK30, CM40 (CC-2)
Recommended speeds and feeds for the slab (or plain) milling of ferrous and nonferrous alloys with high-speed steel cutters
Material Hardness, HB Condition Depth of cut, mm (in.) Speed Feed per tooth High-speed steel tool material
m/min sfm mm (in.) ISO AISI
Wrought austenitic stainless steel 321 135-185 HB Annealed 1 (0.040) 55 180 0.15 (0.006) S4, S2 M2, M7
4 (0.150) 43 140 0.20 (0.008)
8 (0.300) 34 110 0.25 (0.010)
Recommended speeds and feeds for the end milling (peripheral) of ferrous and nonferrous alloys with both high-speed steel and carbide
cutters
Material Hardness, HB Condition Radial depth of cut, mm (in.) High-speed steel tool Carbide tool
Speed, m/min (sfm) Feed, mm/tooth (in./tooth), at cutter diameter of: Tool material, ISO (AISI) Speed, m/min (sfm) Feed, mm/tooth (in./tooth), at cutter diameter of: Tool material, ISO (C)
10 mm (.375in) 12 mm (.5 in) 18 mm (.75 in) 25-50 mm (1-2 in.) 10 mm (.375in) 12 mm (.5 in) 18 mm (.75 in) 25-50 mm (1-2 in.)
SS321 135-185 HB) Annealed 0.5 (0.020) 34 (110) 0.025 (0.001) 0.050 (0.002) 0.102 (0.004) 0.13 (0.005) S4, S5, S2 (M2, M3, M7) 110 (360) 0.013 (0.0005) 0.025 (0.001) 0.050 (0.002) 0.102 (0.004) K20, M20 (C-2)
1.5 (0.060) 24 (80) 0.050 (0.002) 0.075 (0.003) 0.13 (0.005) 0.15 (0.006) 82 (270) 0.025 (0.001) 0.050 (0.002) 0.075 (0.003) 0.13 (0.005)
diam/4
diam/4
21 (70) 0.025 (0.001) 0.050 (0.002) 0.102 (0.004) 0.13 (0.005) 72 (235) 0.025 (0.001) 0.038 (0.0015) 0.063 (0.0025) 0.102 (0.004)
diam/2
diam/2
18 (60) 0.025 (0.001) 0.038 (0.0015) 0.075 (0.003) 0.102 (0.004) 67 (220) 0.013 (0.0005) 0.025 (0.001) 0.050 (0.002) 0.075 (0.003)
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