ASTM A240 347 Plate,A240 347 Sheet,SS347 Stainless steel plate
ASTM A240 347 stainless steel has a high resistance to prolonged heat and good mechanical properties with higher creep and stress rupture characteristics than other grades,it widely used in engine,power generation,welded fabrications and other high temperature applications.
Stainless Steel 347 is similar to the 321 stainless steels in that it is often used as a stabilized alternative to Type 304. In the case of 347, however, the stabilizing agent is columbium. This metal intensifies 347’s already present ability to withstand intergranular corrosion for maximum capabilities. Additionally, the columbium allows for 347 to undergo repeated heating in temperatures up to 1650° F. As a result, the metal is commonly applied to high temperature equipment, such as gaskets and expansion joints, along with rocket engine and chemical manufacturing.
In addition to its heat resistance properties, 347 also enjoys better resistance against creep and stress rupture corrosions. This is another advantage of type 304, as 347’s characteristics may be better suited for environments where stabilization is a primary concern.
Type 347 is known for being workable under all common welding techniques, along with hot and cold working. However, when being heat treated the metal must be heated up in the range of 2100 to 2250°F. This is due to 347’s inability to work harden under heat treatment. Cold reduction is the only method that will utilize the alloy’s elevated properties.
ASTM A240 347 stainless steel plate specification:
Thickness :0.8mm -100mm
Width :500mm-2500mm
Length :000mm-12000mm
ASTM A240 347 plate Chemical Composition:
| Grade | C | Si | Mn | P | S | Cr | Mo | Ni | N | Other |
| 347 | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 17.00-19.00 | – | 9.00-13.00 | – | Cb:10xC1.00 |
ASTM A240 347 plate Mechanical Properties:
| Grade | Proof Stress 0.2% (MPa) |
Tensile Strength (MPa) |
Elongation A5(%) |
Hardness Max | |
| HB | HRB | ||||
| 347 | 205 | 515 | 40 | 201 | 92 |
ASTM A240 347 stainless steel sheet is widely used to high temperature gaskets and expansion joints,rocket engine parts,aircraft collector rings and exhaust manifolds and chemical production equipment.
Stainless Steel 347H is another stainless steel in a class of metals labeled of precipitation-hardened steels. It possesses many of the same properties and characteristics of stainless steel 347. In addition to its higher carbon content, the alloy is stabilized with an addition of columbium, or sometimes tantalum. Both these properties allow 347H to be exposed to higher temperatures than both 347 and the 304 stainless steel grades can withstand. Because of its elevated resistance to corrosion, 347H is often applied in high stress, high corrosion environments where exposure tends to be severe. High temperature manufacturing, steam pipes, boiler tubes, chemical processes and steam servicing all benefit from 347H’s resilience. This resilience in turn is due to the potentially elevated levels of chromium in 347H’s composition. The metal can contain anywhere from 4-30%.
The metal displays high workability under most common welding techniques. It can be treated with heat, however, it will not respond. Only cold working is sufficient to increase 347H’s toughness and strength.
Surface Finishes For ASTM A240 Steel Plates:
| Class | Definition | Application |
|---|---|---|
| No.1 | With heat treatment after hot rolling, pickling or equivalent. | Chemical tank, piping |
| No.2D | After cold rolling, carry out heat treatment and pickling or other equivalent processing. In addition, also including use of blunt surface roller to do final cold rolling slightly. | Heat exchanger, drain-pipe |
| No.2B | After cold rolling, carry out heat treatment and pickling or other equivalent processing. And use cold rolling processing to make surface brightness appropriately | Medical equipment, food industry, building materials, kitchen utensils |
| BA | After cold rolling, carry out bright heat treatment | Eat hutch appliance, electrical appliances, construction decoration |
| No.3 | Use 100# ~ 120# abrasives to do the grinding processing | Eat hutch appliance, construction decoration |
| No.4 | Use 150# ~ 180# abrasives to do the grinding processing | Eat hutch appliance, construction decoration, Medical equipment |
| No.8 | Use 600 # rotary polishing wheel to do the grinding | Mirror, decoration |
| HL | Use appropriate particle size of abrasives to do the grinding and make the surface with grinding stripe | Construction decoration |
ASME SA240 is identical with ASTM A240
ASTM A240 / A240M
STANDARD SPECIFICATION FOR CHROMIUM AND CHROMIUM-NICKEL STAINLESS STEEL PLATE, SHEET, AND STRIP FOR PRESSURE VESSELS AND FOR GENERAL APPLICATIONS
ASTM A240 specification covers chromium, chromium-nickel, and chromium-manganese-nickel stainless steel plate, sheet, and strip for pressure vessels and for general applications including architectural, building, construction, and aesthetic applications.
ASTM-A480 › Standard Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip
Table A2.17 Permitted Variation in Thickness of Hot-Rolled Mill Plate (Quarto Plate)*, **
| Width (w), in. [mm] | ||||
|---|---|---|---|---|
| Specified Thickness (t), in. [mm] | w ≤ 84 [2134] | 84 [2134] < w ≤ 120 [3048] | 120 [3048] < w ≤ 144 [3658] | w > 144 [ 3658] |
| Tolerance Over Specified Thickness, *** in. [mm] | ||||
| t < 3/16 [4.76] | 0.055 [1.35] | 0.070 [1.78] | — | — |
| 3/16 [4.76] ≤ t < 3/8 [9.52] | 0.045 [1.14] | 0.050 [1.27] | 0.085 [2.16] | — |
| 3/8 [9.52] ≤ t < 3/4 [19.05] | 0.055 [1.40] | 0.060 [1.52] | 0.085 [2.16] | 0.090 [2.29] |
| 3/4 [19.05] ≤ t < 1 [25.04] | 0.060 [1.52] | 0.065 [1.65] | 0.085 [2.16] | 0.100 [2.54] |
| 1 [25.40] ≤ t < 2 [50.80] | 0.070 [1.78] | 0.075 [1.90] | 0.095[2.41] | 0.115 [2.92] |
| 2 [ 50.80] ≤ t < 3 [76.20] | 0.125 [3.20] | 0.150[3.80] | 0.175 [4.45] | 0.200 [5.08] |
| 3 [76.20] ≤ t < 4 [101.6] | 0.150 [3.81] | 0.160 [4.06] | 0.200 [5.08] | 0.225 [5.72] |
| 4 [101.6] ≤ t < 6 [152.4] | 0.180 [4.75] | 0.200 [5.08] | 0.335 [8.50] | 0.355 [9.02] |
| 6 [152.4] ≤ t < 8 [203.2] | 0.235 [6.00] | 0.255 [6.48] | 0.355 [9.02] | 0.435 [11.0] |
| 8 [203.2] ≤ t < 10 [254.0] | 0.315 [8.00] | 0.335 [8.50] | 0.435 [11.0] | 0.550 [14.0] |
* Thickness is measured along the longitudinal edges of the plate at least 3/8 in. [9.52mm], but not more than 3 in. [76.20 mm], from the edge.
** For plates up to 10 in. [254.0mm], excl, in thickness, the tolerance under the specified thickness is 0.010 in. [0.25 mm].
*** For circles, the over thickness tolerances in this table apply to the diameter of the circle corresponding to the width ranges shown. For plates of irregular shape, the over thickness tolerances apply to the greatest width corresponding to the width ranges shown.
Below is the Tolerance for Flatness taken from ASTM A480
(Understand that this covers Mill Plates and not cut pieces)
Table A2.20 Permitted Variations in Flatness of Plate Mill Plate (Quarto Plate)
Note 1 — Tolerances in this table apply to any length, not necessarily the rolling direction, up to 36 in. [914mm] and to any 36 in. [914mm] of longer lengths in the plane of the plate measured while the plate rests on a flat surface with the concavity of the curvature upward.
Note 2 — If the longer dimension is under 36 in. [914mm], the tolerance is not greater than 1/4 in. [6.4mm].
Note 3 — for plates with specified minimum yield strengths of 35 ksi [240MPa] or more, the permitted variations are increased to 1 1/2 times the amounts shown.
| Specified Thickness (t), in. [mm] | Flatness Tolerance for Thicknesses Given, in. [mm] |
|---|---|
| t < 1/4 [6.35] | 7/16 [11] |
| 1/4 [6.35] ≤ t < 3/8 [9.52] | 3/8 [9.5] |
| 3/8 [9.52] ≤ t < 1/2 [12.70] | 5/16 [7.9] |
| 1/2 [12.70] ≤ t < 3/4 [19.05] | 5/16 [7.9] |
| 3/4 [19.05] ≤ t < 1 [25.40] | 5/16 [7.9] |
| 1 [25.40] ≤ t < 1 1/2 [38.10] | 1/4 [6.4] |
| 1 1/2 [38.10] ≤ t < 4 [101.60] | 1/4 [6.4] |
| t ≥ 4 [101.60] | 1/4 [6.4] |
