AISI 416 Flat Bars

AISI 416 HRAP flat bar is a free-machining martensitic stainless flat, milled and sawn into valve parts, keys, gibs and machined blocks.

20 to 150 mm wide Martensitic stainless steel Made to order

HRAP FLAT BARS

AISI 416 flat bar

AISI 416 hot rolled, annealed and pickled flat bar is a martensitic stainless flat rolled from the free-machining grade, which is AISI 410 with sulphur added. Sulphur is specified at 0.15 percent or more, and the manganese sulphide it forms breaks the chip at the tool, so the flat can be milled, drilled and sawn at feeds 410 will not take. Chromium of 12 to 14 percent leaves the corrosion class of 410 unchanged, but the same sulphides interrupt the passive film and give pitting a place to start, and they lower toughness. 410 flat is chosen where the part is welded or takes shock; 416 where the flat is mostly cut away and machining time decides the cost.

The flat is supplied annealed, soft enough to cut, and is hardened afterwards where the part calls for it by austenitising, which reheats the steel until its structure changes, then quenching and tempering to the hardness wanted. It is magnetic in every condition. Pickling leaves a clean grey surface, so the first cut is taken through metal and not through mill scale, which matters on a flat where whole faces are milled. Welding is avoided, because the sulphides crack the weld metal as it cools. Flat bar in this grade is machined into valve and pump parts, gland and cover plates, keys, gibs and wear strips, and blocks sawn off for milled components. Laxcon Steels rolls the flat to order.

Composition limits in weight percent are carbon 0.15 maximum, manganese 1.25 maximum, sulphur 0.15 minimum, phosphorus 0.06 maximum, silicon 1.0 maximum, chromium 12.0 to 14.0 and zirconium plus molybdenum 0.6 maximum.

SPECIFICATION

AISI 416 flat bar supply conditions

Length: Up to 6.4 metres
Supply condition: Hot rolled, Annealed & Pickled (HRAP)
Tolerance: ASTM A484, EN 10058
Grade: AISI 416 (416, SUS 416, 1.4005, S41600)
Family: Martensitic stainless steel
Supply: Made to order in this grade; every published size of the form

Composition of AISI 416

Element	Symbol	Minimum %	Maximum %
Carbon	C		0.15
Manganese	Mn		1.25
Sulphur	S	0.15
Phosphorus	P		0.06
Silicon	Si		1.0
Chromium	Cr	12.0	14.0
Zirconium plus molybdenum	Zr+Mo		0.6

Composition, weight percent, balance iron. From the Laxcon Steels grade reference.

Equivalents of AISI 416

Standard	Designation
UNS	S41600
EN number	1.4005
JIS	SUS 416

Equivalence means nearest counterpart, not identity: each standards body sets its own composition window, so the limits of the standard named on the order govern.

Governing standards

EN 10088-3: Stainless steels: technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products for general purposes. Composition, heat treatment condition and mechanical properties per grade.
EN 10058: Hot rolled flat steel bars for general purposes: dimensions and tolerances on shape and dimensions.
ASTM A276/A276M: Stainless steel bars and shapes: composition, condition, mechanical properties and finish designations for hot-finished and cold-finished bar.
ASTM A484/A484M: General requirements for stainless steel bars, billets and forgings: permissible variations in dimensions, straightness, weight and length, and the test and marking requirements every bar order inherits.
ASTM A582/A582M: Free-machining stainless steel bars: the specification under which 303 and the other resulphurised grades are supplied.
EN 10204: Metallic products, types of inspection documents: the 2.2 test report and the 3.1 and 3.2 inspection certificates a purchase order can call for.

Weight per metre

Width (mm)	Thickness (mm)	kg per metre
20	15	2.37
20	16	2.53
21	17.5	2.90
22 / 22.8	11	1.91
22 / 22.8	13	2.26
22 / 22.8	16	2.78
22 / 22.8	17	2.95
22 / 22.8	18	3.13
22 / 22.8	19.5	3.39
23.5	14.5	2.69
25/25.4	8	1.58
25/25.4	10	1.98
25/25.4	12	2.37
25/25.4	12.7	2.51
25/25.4	15	2.96
25/25.4	20	3.95
26	11	2.26
26	13	2.67
26	16	3.29
26	21	4.31
28.5	14	3.15
30	6	1.42
30	8	1.90
30	10	2.37
30	12	2.84
30	15	3.56
30	16	3.79
30	20	4.74
31.75/32	9	2.26
31.75/32	11	2.76
31.75/32	12.7	3.19
31.75/32	13	3.26
31.75/32	15	3.76
31.75/32	16	4.01
31.75/32	20	5.02
31.75/32	21	5.27
35	6	1.66
35	8	2.21
35	10	2.77
35	15	4.15
35	20	5.53
36	23	6.54
36	27.5	7.82
38	23.5	7.05
38.1	6.35	1.91
40	5	1.58
40	6	1.90
40	8	2.53
40	10	3.16
40	12	3.79
40	15	4.74
40	16	5.06
40	20	6.32
40	25	7.90
40	30	9.48
42	11	3.65
42	13	4.31
42	16	5.31
42	22	7.30
42	26	8.63
42	32	10.62
45	6	2.13
45	8	2.84
45	10	3.56
45	15	5.33
45	20	7.11
45	25	8.89
50/50.8	5	1.98
50/50.8	6	2.37
50/50.8	8	3.16
50/50.8	10	3.95
50/50.8	12	4.74
50/50.8	12.7	5.02
50/50.8	15	5.93
50/50.8	16	6.32
50/50.8	20	7.90
50/50.8	25	9.88
50/50.8	30	11.85
50/50.8	40	15.80
52	11	4.52
52	16	6.57
52	21	8.63
52	26	10.68
52	32	13.15
52	42	17.25
55	5	2.17
55	6	2.61
55	8	3.48
55	10	4.35
55	12	5.21
55	15	6.52
55	16	6.95
55	20	8.69
55	25	10.86
57	32	14.41
60	6	2.84
60	8	3.79
60	10	4.74
60	15	7.11
60	20	9.48
60	25	11.85
60	30	14.22
60	32	15.17
60	35	16.59
60	40	18.96
63/63.5	11	5.47
63/63.5	13	6.47
63/63.5	15	7.47
63/63.5	16	7.96
63/63.5	20	9.95
63/63.5	21	10.45
63/63.5	25	12.44
63/63.5	30	14.93
63/63.5	32	15.93
63/63.5	42	20.90
65	8	4.11
65	10	5.14
65	15	7.70
65	16	8.22
65	20	10.27
65	25	12.84
65	30	15.41
65	32	16.43
65	35	17.97
65	40	20.54
70	8	4.42
70	20	11.06
70	25	13.83
70	30	16.59
70	40	22.12
72	11	6.26
72	21	11.94
75/76.2	5	2.96
75/76.2	8	4.74
75/76.2	10	5.93
75/76.2	12	7.11
75/76.2	12.7	7.52
75/76.2	15	8.89
75/76.2	20	11.85
75/76.2	25	14.81
75/76.2	30	17.78
80	8	5.06
80	10	6.32
80	15	9.48
80	20	12.64
80	25	15.80
80	30	18.96
80	35	22.12
80	40	25.28
80	50	31.60
82	11	7.13
82	13	8.42
82	16	10.36
82	21	13.60
82	31	20.08
90	8	5.69
90	10	7.11
90	15	10.67
90	20	14.22
90	30	21.33
90	40	28.44
90	50	35.55
100/101.6	6	4.74
100/101.6	6.35	5.02
100/101.6	8	6.32
100/101.6	10	7.90
100/101.6	11	8.69
100/101.6	12	9.48
100/101.6	12.7	10.03
100/101.6	13	10.27
100/101.6	15	11.85
100/101.6	20	15.80
100/101.6	25	19.75
100/101.6	30	23.70
100/101.6	40	31.60
120	10	9.48
120	12	11.38
120	15	14.22
120	16	15.17
150	10	11.85
150	12	14.22
150	15	17.78
150	16	18.96
150	20	23.70

Density 7.90 g/cm³, width x thickness x 0.00790. Where a width is listed with two values (25/25.4) the first is used.

Ordering AISI 416 flat bar

An enquiry for this grade in this form states the grade and the governing standard, for example AISI 416 to EN 10088-3 or ASTM A276, the condition, annealed or hardened and tempered to a stated hardness, the width and thickness with the tolerance to EN 10058 or ASTM A484, the cut length, the quantity, the test certificate type to EN 10204, and any test called for, such as PMI or ultrasonic testing.