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ASTM A202 Grade B is a chromium-manganese-silicon low-alloy steel tailored for high-pressure, medium-temperature pressure vessel applications.2026-04-30
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ASTM A202 Grade A is a critical chromium-manganese-silicon low-alloy steel plate specifically designed for welded pressure vessels and boilers operating at medium temperatures.2026-04-30
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ASTM A202 Pressure Vessel Steel Material and Grades:
Alloy System: **Chromium-Manganese-Silicon (Cr-Mn-Si)** Low-Alloy Heat-Resistant Steel2026-04-17 -
ASTM A204/A204M Grade B molybdenum alloy steel plates for pressure vessels feature superior chemical composition and mechanical properties compared to Grade A2026-04-10
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As a molybdenum-alloy steel plate for pressure vessels under the ASTM A204/A204M standard, A204 Gr.A is a low-alloy, high-strength material specifically designed for service conditions involving moderate temperatures (≤400°C) and moderate-to-high pressure2026-03-31
AISI 4140 High Tensile Steel bar
AISI 4140 high tensile steel bar is a chromium-molybdenum alloy steel. The chromium content provides good hardness penetration, and the molybdenum content ensures uniform hardness and high strength. AISI 4140 chrome-molybdenum steel can be oil hardened to a relatively high level of hardness. The desirable properties of the AISI 4140 high tensile steel bar include superior toughness, good ductility and good wear resistance in the quenched and tempered condition.
Size of AISI 4140 high tensile steel bar:
Rounds: 8 mm to 690 mm Diameter
Hexagons: 19.05 mm to 65 mm A/F
Hollow Bar: 63 mm to 250 mm OD
Square: 32 mm to 130 mm
Pre hardened and tempered AISI 4140 high tensile steel bar can be further surface hardened by flame or induction hardening and by nitride.
AISI 4140 high tensile steel bar can be further surface hardened by either the flame or induction hardening methods resulting in a case hardness in excess of Rc50. Parts should be heated as quickly as possible to the austenitic temperature range (840 C - 870 C) and "required case depth followed by an immediate oil or water quench, depending upon hardness required, work piece" size/shape and quenching arrangements.