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ASTM A350 / A350M − 13 — Carbon & Low-Alloy Steel Forgings (Low-Temperature, Notch Toughness)

Dipti Metal Industries supplier of ASTM A350 flanges, ASTM A350 forged fittings (ASTM A350 socket-weld & ASTM A350 threaded), ASTM A350 valves and pressure-containing ASTM A350 parts per ASTM A350/A350M − 13 for low-temperature service, with Charpy V-notch impact testing as required. General purchasing and QA/QC follow ASTM A961/A961M.

  • Grades: LF1, LF2 (CL1/CL2), LF3 (CL1/CL2), LF5 (CL1/CL2), LF6 (CL1/CL2/CL3), LF9, LF787
  • Heat treatment: Normalized / Normalized & Tempered / Quenched & Tempered • LF787 in precipitation-treated conditions
  • Dimensional refs: ASME B16.5, B16.11, B16.34, B16.47, etc.; API 600/602/605 as applicable
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Spec in inch-pound & SI. Unless “M” is specified on PO, inch-pound applies. Verify requirements against latest revision and project code.

Dipti Metal Industries — A350/A350M Forgings Partner

We are manufacturer ASTM A350,ASTM A350 exporter,ASTM A350 supplier,ASTM A350 stokiest and dealingring-rolled & open-die forgings ASTM A350 for LT service with full heat traceability, CVN testing, and EN 10204 3.1/3.2 certification. Materials are fully killed, fine-grain practice; melt routes include EAF/BOF/OH with optional VIM/ESR/VAR as ordered.

Ordering Checklist (per A961/A961M & Section 3)

  • Item & qty (flanges, SW/THD fittings, valves/parts)
  • Grade & Class (see tables), heat treatment condition
  • Dimensional standard (ASME/API) & NDE
  • Impact test temperature (standard or S1 alternate)
  • Reports needed (# of MTC copies; see Section 14)

Manufacture & HT (Section 5)

  • Forging stock: ingot, bloom/billet/slab/bar; ring-rolled/forged
  • HT options: N; N&T; Q&T (tempering ≥1100 °F / 590 °C)
  • LF787: Normalized + Precipitation or Quenched + Precipitation

Products We Supply to ASTM A350/A350M

Flanges

TypeDimensional StandardRatings
ASTM A350 Weld Neck, ASTM A350 Slip-On, ASTM A350 Blind, ASTM A350 Lap-Joint, ASTM A350 Threaded, ASTM A350 Socket-WeldASME B16.5 / B16.47Class 150 – 2500
ASTM A350 Orifice, ASTM A350 Spectacle BlindsASME B16.5 / MSSAs ordered

Forged Fittings

TypeStandardClass
ASTM A350 Socket-Weld Elbows/ASTM A350 Tees/ASTM A350 Couplings/ASTM A350 CapsASME B16.113000# / 6000# / 9000#
ASTM A350 Threaded (NPT/BSPT) ASTM A350 Elbows/ASTM A350 Tees/ASTM A350 Unions/ASTM A350 Bushings/ASTM A350 PlugsASME B16.112000# / 3000#

Valves & Parts

ItemDimensional/DesignNotes
ASTM A350 Gate/ASTM A350 Globe/ASTM A350 Check Bodies, Bonnets, StemsASME B16.10 / B16.34 • API 600/602Hydro per order (A961 S57 if specified)

Chemical Composition — Summary (Heat Analysis)

Summarized from your provided table; product analysis tolerances per A961/A961M. Leaded steels not permitted. “B/C” notes: alloy sum limits apply.

GradeKey Elements (wt%)Notes
LF1C ≤0.30 • Mn 0.60–1.35 • Si 0.15–0.30 • P ≤0.035 • S ≤0.040 • (Cu+Ni+Cr+V+Mo) ≤1.00Vacuum C-deoxidation optional (S4)
LF2 CL1/CL2C ≤0.30 • Mn 0.60–1.35 • Si 0.15–0.30 • P ≤0.035 • S ≤0.040 • B/C alloy sum limitsCommon LT flange grade
LF3 CL1/CL2C ≤0.20 • Ni 3.3–3.7 • Mn ≤0.90 • Si 0.20–0.35 • P ≤0.035 • S ≤0.040For very low temperatures
LF5 CL1/CL2Ni 1.0–2.0 • Mn 0.60–1.35 • Si 0.20–0.35 • P ≤0.035 • S ≤0.040Ni-bearing carbon steel
LF6 CL1/2/3C ≤0.22 • Mn 1.15–1.50 • Si 0.15–0.30 • V 0.04–0.11 • P ≤0.025 • S ≤0.025Higher strength option
LF9Ni 1.60–2.24 • Cu 0.75–1.25 • Mn 0.40–1.06 • P ≤0.035 • S ≤0.040LT with Ni+Cu
LF787C ≤0.07 • Ni 0.70–1.00 • Cr 0.60–0.90 • Mo 0.15–0.25 • Cu 1.00–1.30 • Cb ≥0.02 • Si ≤0.40 • P/S ≤0.025Precipitation-treated; special classes

Mechanical Properties — Room Temperature (Summary)

Grade / ClassTensile (ksi) rangeYS min (ksi)Elong. minRA minNotes
LF1 (CL1)60–853025% (4D) / 28% (2")38%
LF2 (CL1/CL2)70–953622% / 30%30%CL2 impact at higher temp
LF3 (CL1/CL2)70–9537.522% / 30%35%Very low temp service
LF5 (CL1/CL2)66–915222% / 30%40%
LF6 (CL1/2/3)75–1006020% / 28%40%≤197 HBW after HT
LF963–884625% / 28%38%
LF787 (by class)65–9555/6520% / 28%45%Precipitation-treated

YS per 0.2% offset or 0.5% EUL (round specimens). Hardness: ensure ≤197 HBW after property HT (A961). Exact values vary by class—see MTC.

Charpy V-Notch (CVN) — Energy & Standard Test Temperatures

Grade / ClassStandard CVN TempAvg Energy (3 pcs)One-Min of Set
LF1−20 °F [−29 °C]13 ft·lb [18 J]10 ft·lb [14 J]
LF2 CL1−50 °F [−46 °C]15 [20]12 [16]
LF2 CL20 °F [−18 °C]20 [27]15 [20]
LF3 CL1/CL2−150 °F [−101 °C]15 / 2012 / 15
LF5 CL1/CL2−75 °F [−59 °C]15 [20]12 [16]
LF6 CL1−60 °F [−51 °C]15 [20]12 [16]
LF6 CL2/CL3−60 °F / 0 °F20 [27]15 [20]
LF9−100 °F [−73 °C]13 [18]10 [14]
LF787 CL2/CL3−75 °F / −100 °F15 [20]12 [16]

Subsize specimens: adjust energy (proportional) and/or test temperature per thickness & width rules. S1 allows other test temperatures—marking must include temperature suffix (e.g., LF2S 0175 for −175 °F).

Options, CE Limits & Repairs

  • Carbon Equivalent (CE): CE = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15. Typical maxima (heat analysis): LF1 0.45/0.46 (≤/> 2"), LF2 CL1/2 0.47/0.48, LF6 CL1 0.45/0.46, LF6 CL2 0.47/0.48.
  • Supplementary reqs: S1 (other CVN temps), S2 (stress-relieved specimens), S3 (report lateral expansion), S4 (vacuum C-deoxidized), S5 (special flange CVN sampling).
  • Weld repair: Qualified WPS/PQR per ASME IX; CVN on weld & HAZ; electrodes per grade; SR or re-HT; area limits; mark “W”.
  • Hydrostatic test: As ordered (A961 S57). Capable of rating; performed when specified.

🌍 Global ASTM A350 Export Coverage

We ASTM A350 export to 190+ countries.

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Africa

Algeria Algeria, Angola Angola, Benin Benin, Botswana Botswana, Burkina Faso Burkina Faso, Burundi Burundi, Cabo Verde Cabo Verde, Cameroon Cameroon, Central African Republic Central African Republic, Chad Chad, Comoros Comoros, Congo (Republic) Congo (Republic), Congo (DRC) Congo (DRC), Côte d’Ivoire Côte d’Ivoire, Djibouti Djibouti, Egypt Egypt, Equatorial Guinea Equatorial Guinea, Eritrea Eritrea, Eswatini Eswatini, Ethiopia Ethiopia, Gabon Gabon, Gambia Gambia, Ghana Ghana, Guinea Guinea, Guinea-Bissau Guinea-Bissau, Kenya Kenya, Lesotho Lesotho, Liberia Liberia, Libya Libya, Madagascar Madagascar, Malawi Malawi, Mali Mali, Mauritania Mauritania, Mauritius Mauritius, Morocco Morocco, Mozambique Mozambique, Namibia Namibia, Niger Niger, Nigeria Nigeria, Rwanda Rwanda, São Tomé & Príncipe São Tomé & Príncipe, Senegal Senegal, Seychelles Seychelles, Sierra Leone Sierra Leone, Somalia Somalia, South Africa South Africa, South Sudan South Sudan, Sudan Sudan, Tanzania Tanzania, Togo Togo, Tunisia Tunisia, Uganda Uganda, Zambia Zambia, Zimbabwe Zimbabwe

Americas

Antigua & Barbuda Antigua & Barbuda, Argentina Argentina, Bahamas Bahamas, Barbados Barbados, Belize Belize, Bolivia Bolivia, Brazil Brazil, Canada Canada, Chile Chile, Colombia Colombia, Costa Rica Costa Rica, Cuba Cuba, Dominica Dominica, Dominican Republic Dominican Republic, Ecuador Ecuador, El Salvador El Salvador, Grenada Grenada, Guatemala Guatemala, Guyana Guyana, Haiti Haiti, Honduras Honduras, Jamaica Jamaica, Mexico Mexico, Nicaragua Nicaragua, Panama Panama, Paraguay Paraguay, Peru Peru, Saint Kitts & Nevis Saint Kitts & Nevis, Saint Lucia Saint Lucia, Saint Vincent & the Grenadines Saint Vincent & the Grenadines, Suriname Suriname, Trinidad & Tobago Trinidad & Tobago, United States United States, Uruguay Uruguay, Venezuela Venezuela

Asia

Afghanistan Afghanistan, Armenia Armenia, Azerbaijan Azerbaijan, Bahrain Bahrain, Bangladesh Bangladesh, Bhutan Bhutan, Brunei Brunei, Cambodia Cambodia, China China, Cyprus Cyprus, Georgia Georgia, India India, Indonesia Indonesia, Iran Iran, Iraq Iraq, Israel Israel, Japan Japan, Jordan Jordan, Kazakhstan Kazakhstan, Kuwait Kuwait, Kyrgyzstan Kyrgyzstan, Laos Laos, Lebanon Lebanon, Malaysia Malaysia, Maldives Maldives, Mongolia Mongolia, Myanmar Myanmar, Nepal Nepal, North Korea North Korea, Oman Oman, Philippines Philippines, Qatar Qatar, Saudi Arabia Saudi Arabia, Singapore Singapore, South Korea South Korea, Sri Lanka Sri Lanka, Syria Syria, Tajikistan Tajikistan, Thailand Thailand, Timor-Leste Timor-Leste, Turkey Turkey, Turkmenistan Turkmenistan, United Arab Emirates United Arab Emirates, Uzbekistan Uzbekistan, Vietnam Vietnam, Yemen Yemen

Europe

Albania Albania, Andorra Andorra, Austria Austria, Belarus Belarus, Belgium Belgium, Bosnia & Herzegovina Bosnia & Herzegovina, Bulgaria Bulgaria, Croatia Croatia, Czechia Czechia, Denmark Denmark, Estonia Estonia, Finland Finland, France France, Germany Germany, Greece Greece, Hungary Hungary, Iceland Iceland, Ireland Ireland, Italy Italy, Kosovo Kosovo,

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FAQ — ASTM A350/A350M − 13

Scope

Forged or ring-rolled flanges, forged fittings and valves/parts for low-temperature service requiring Charpy V-notch toughness; some parts may be machined from rolled bar or seamless tubulars (limits apply).

Units

Dual units (inch-pound & SI). Unless “M” is specified, inch-pound applies. Do not mix systems.

General Requirements

A961/A961M applies for test methods, marking, certification, and supplementary requirements. Where conflicts exist, A350/A350M prevails.